example doc restructure

working and hopefully illustrative doc skeleton

update requirements

WIP
Change log:
- Upload new PyMC logo
- Updated conf.py to pymc instead of pymc3
- Start configuring and populating index page
- Start configuring and populating learning page
- Start configuring and populating api page
- Updated API to follow the docs/Architecture.png layout
- Start configuring and populating learning page
- Fix typo in filename of "index legacy"

add community page, other minor changes

Continue restructuring the API
Delete conflicting files

example doc restructure

update requirements

update requirements and gitignore

some fixes

add changes introduced by pre-commit checks

fix community page title

update api for distributions

update gaussian process api

fix end of file

more changes

sponsor logos

sponsor logos cleanup, other changes

changes to satisfy pre-commit checks

requirements changes

minor changes

Add testimonials to docs homepage

remove sphinx panels and other changes

center buttons

add explanation of MAP to glassor

minor change

fix typo

minor changes

put content in videos and podcasts section. Change formatting of testimonials (width of 2 cards for better formating in narrow screens)

add code example to front page

revise some definitions (#5126)

minor changes

minor changes

WIP: organizing notebooks into learning section

- Add information for institutions in the Contributing section
- Center navbar
- Split the About section into a main page with multiple subpages
- Remove old reference to "developers" in the index toctree

Co-authored-by: Oriol Abril-Pla <oriol.abril.pla@gmail.com>