What's Changed
* Add 0.20.0 release notes to toc by jcapriot in https://github.com/simpeg/simpeg/pull/1277
* add plausible analytics to simpeg docs by lheagy in https://github.com/simpeg/simpeg/pull/1279
* Refresh links in documentation by mplough-kobold in https://github.com/simpeg/simpeg/pull/1282
* Run pytest on Azure with increased verbosity by santisoler in https://github.com/simpeg/simpeg/pull/1287
* Allow to use random seed in make_synthetic_data by santisoler in https://github.com/simpeg/simpeg/pull/1286
* pgi doc by thibaut-kobold in https://github.com/simpeg/simpeg/pull/1291
* Fix deprecation warning for gradientType in SparseSmoothness by santisoler in https://github.com/simpeg/simpeg/pull/1284
* Gravity simulation with Choclo as engine by santisoler in https://github.com/simpeg/simpeg/pull/1285
* Fix minor flake8 warning by santisoler in https://github.com/simpeg/simpeg/pull/1307
* ISSUE-1298: Use normal distributed noise in example. by domfournier in https://github.com/simpeg/simpeg/pull/1312
* Ditch deprecated functions in utils.model_builder by domfournier in https://github.com/simpeg/simpeg/pull/1311
* Triaxial magnetic gradient forward modelling by thibaut-kobold in https://github.com/simpeg/simpeg/pull/1288
* Documentation improvements for classes in Objective Function Pieces by ghwilliams in https://github.com/simpeg/simpeg/pull/1292
* Fix description of source_field in gravity survey by santisoler in https://github.com/simpeg/simpeg/pull/1322
* Add `weights_keys` method to `BaseRegularization` by santisoler in https://github.com/simpeg/simpeg/pull/1320
* Bump versions of flake8 and black and pin flake plugins by santisoler in https://github.com/simpeg/simpeg/pull/1330
* Move `__init__` in `BaseSimulation` to the top of the class by santisoler in https://github.com/simpeg/simpeg/pull/1323
* Simpeg vector update by johnweis0480 in https://github.com/simpeg/simpeg/pull/1329
* Fix typo in error messages by santisoler in https://github.com/simpeg/simpeg/pull/1324
* Fix issue with lengthscales in coterminal angle calculations by domfournier in https://github.com/simpeg/simpeg/pull/1299
* Simplify check for invalid multipliers by santisoler in https://github.com/simpeg/simpeg/pull/1336
* Ravel instead of flatten by thibaut-kobold in https://github.com/simpeg/simpeg/pull/1343
* Fix implementation of coterminal function by domfournier in https://github.com/simpeg/simpeg/pull/1334
* Update cross gradient hessian approximation by jcapriot in https://github.com/simpeg/simpeg/pull/1355
* ISSUE-1341: Set parent of objective functions by domfournier in https://github.com/simpeg/simpeg/pull/1342
* Fix partial derivatives in regularization docs by santisoler in https://github.com/simpeg/simpeg/pull/1362
* Remove factor of half in data misfits and regularizations by lheagy in https://github.com/simpeg/simpeg/pull/1326
* Improvements to template for a bug report issue by lheagy in https://github.com/simpeg/simpeg/pull/1359
* Simplify a few gravity simulation tests by santisoler in https://github.com/simpeg/simpeg/pull/1363
* Exponential Sinusoids Simulation by lheagy in https://github.com/simpeg/simpeg/pull/1337
* Replace magnetic SourceField for UniformBackgroundField by santisoler in https://github.com/simpeg/simpeg/pull/1364
* Remove deprecated regularization classes by santisoler in https://github.com/simpeg/simpeg/pull/1365
* Removed deprecated properties of UpdateSensitivityWeights by santisoler in https://github.com/simpeg/simpeg/pull/1368
* Replace indActive for active_cells in regularizations by santisoler in https://github.com/simpeg/simpeg/pull/1366
* Remove the debug argument from InversionDirective by santisoler in https://github.com/simpeg/simpeg/pull/1370
* Remove cellDiff properties of RegularizationMesh by santisoler in https://github.com/simpeg/simpeg/pull/1371
* Remove deprecated bits of code by santisoler in https://github.com/simpeg/simpeg/pull/1372
* Use choclo in gravity tutorials by santisoler in https://github.com/simpeg/simpeg/pull/1378
* Remove surface2ind_topo by santisoler in https://github.com/simpeg/simpeg/pull/1374
* Speed up sphinx documentation building by jcapriot in https://github.com/simpeg/simpeg/pull/1382
* Add docs/sg_execution_times.rst to .gitignore by santisoler in https://github.com/simpeg/simpeg/pull/1380
* Describe merge process of Pull Requests in docs by santisoler in https://github.com/simpeg/simpeg/pull/1375
* Simplify private methods in gravity simulation by santisoler in https://github.com/simpeg/simpeg/pull/1384
* Update Slack links: point to Mattermost by santisoler in https://github.com/simpeg/simpeg/pull/1385
* added getJ for fdem and nsem simulations by JKutt in https://github.com/simpeg/simpeg/pull/1276
* Add LogisticSigmoidMap by ckohnke in https://github.com/simpeg/simpeg/pull/1352
* Remove the cell_weights attribute in regularizations by santisoler in https://github.com/simpeg/simpeg/pull/1376
* Remove regmesh, mref and gradientType from regularizations by santisoler in https://github.com/simpeg/simpeg/pull/1377
* Test if gravity sensitivities are stored on disk by santisoler in https://github.com/simpeg/simpeg/pull/1388
* Check if mesh is 3D when using Choclo in gravity simulation by santisoler in https://github.com/simpeg/simpeg/pull/1386
* Rotated Gradients by jcapriot in https://github.com/simpeg/simpeg/pull/1167
* Add directives to the API Reference by santisoler in https://github.com/simpeg/simpeg/pull/1397
* Remove deprecated modelType in mag simulation by santisoler in https://github.com/simpeg/simpeg/pull/1399
* Remove mref property of PGI regularization by santisoler in https://github.com/simpeg/simpeg/pull/1400
* Add link to User Tutorials to navbar in docs by santisoler in https://github.com/simpeg/simpeg/pull/1401
* Improve documentation for base simulation classes by ghwilliams in https://github.com/simpeg/simpeg/pull/1295
* Enforce regularization `weights` as dictionaries by YingHuuu in https://github.com/simpeg/simpeg/pull/1344
* Minor adjustments to Sphinx configuration by santisoler in https://github.com/simpeg/simpeg/pull/1398
* Update AUTHORS.rst by lheagy in https://github.com/simpeg/simpeg/pull/1259
* Update year in LICENSE by lheagy in https://github.com/simpeg/simpeg/pull/1404
* Dask MetaSim by jcapriot in https://github.com/simpeg/simpeg/pull/1199
* Add Ying and Williams to AUTHORS.rst by santisoler in https://github.com/simpeg/simpeg/pull/1405
* Remove link to "twitter" by jcapriot in https://github.com/simpeg/simpeg/pull/1406
* Bump Black version to 24.3.0 by santisoler in https://github.com/simpeg/simpeg/pull/1403
* Add release notes for SimPEG v0.21 by santisoler in https://github.com/simpeg/simpeg/pull/1409
* Publish documentation on azure by jcapriot in https://github.com/simpeg/simpeg/pull/1412
New Contributors
* mplough-kobold made their first contribution in https://github.com/simpeg/simpeg/pull/1282
* ghwilliams made their first contribution in https://github.com/simpeg/simpeg/pull/1292
* johnweis0480 made their first contribution in https://github.com/simpeg/simpeg/pull/1329
* ckohnke made their first contribution in https://github.com/simpeg/simpeg/pull/1352
* YingHuuu made their first contribution in https://github.com/simpeg/simpeg/pull/1344
**Full Changelog**: https://github.com/simpeg/simpeg/compare/v0.20.0...v0.21.0