Sdss-marvin

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- Updating build to comply with PEP 625
- Updates release action to use recommended build command

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- Made the default API url the "mirror", i.e. point to the new JHU server home.
- Changed the matplotlib ``seaborn-darkgrid`` style to ``seaborn-v0.8-darkgrid``
- Fixed `astropy 6` quantity truthiness error in ``marvin.tools.quantities.spectrum``.
- Removed authentication from `marvin`
- Fixed CI/CD test suite, RTD builds, and other maintenance tasks
- Pins `numpy < 2` and `packaging < 22`

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- Drop support for py <3.7. Min. version is py3.8.
- Updating flask web dependencies: Flask > 2, Jinja2 > 3, werkzeug > 2.0, <2.1
- Removing packaged Flask-JSGlue, replacing with custom 0.3.1 version with correct use of `markupsafe`.
- Pinning miniumum numpy version to 1.20, removing use of `np.int` and `np.float`
- Switch to `packaging.version.parse` from `distutils` for version checking
- Updates test suite to run only on DR17, and on CI on Github Actions. Removes travis yaml.

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- Last tag to support python versions >2.7 up to <3.8
- Pinning `marvin_brain` and `marvin_wtforms_alchemy` dependencies
- Additional docs updates

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- Small tweaks to documentation links and tutorial exercise notebooks
- Pinning markupsafe dependency to < 2.1

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- Small tweaks to the web interface: added tooltips, updated link to SkyServer
- Adds default bintype to Explore page
- Fixes issue :issue:`551` - fix z-index bug in Guided Query Builder
- Fixes issue :issue:`142` - add link to Simbad