* Added Nvector documentation ref https://nvector.readthedocs.io/en/v0.7.5 to refs1.bib and _acknowledgements.py
* Updated README.rst
* Renamed requirements.readthedocs.txt to docs/requirements.txt
* Added .readthedocs.yml
* Added sphinxcontrib-bibtex to requirements.readthedocs.txt
* Added missing docs/tutorials/images/ex3img.png
* Deleted obsolete ex10img.png
* Updated acknowledgement with reference to Karney's article.
* Updated README.rst by moving acknowledgement to the end with references.
* Renamed position input argument to point in the FrameN, FrameB and FrameL classes.
* Deleted _example_images.py
* Renamed nvector.rst to nvector_summary.rst in docs/reference
* Added example images to tutorials/images/ folder
* Added Nvector logo, install.rst to docs
* Added src/nvector/_example_images.py
* Added docs/tutorials/whatsnext.rst
* Reorganized the documentation in docs by splitting _info.py into:
- _intro.py,
- _documentation.py
- _examples_object_oriented.py
- _images.py
- _installation.py and _acknowledgements.py
* Added docs/tutorials/index.rst, docs/intro/index.rst, docs/how-to/index.rst docs/appendix/index.rst and docs/make.bat
* updated references.