This reverts commit fcc97a55.

* updated sphinx version and theme

* WIP

* Updated docs

* Updated index

* wip

* Updated quickstart docs

* WIP

* WIP

* Added different sections

* Changes to indexes

* added example to index

* Update requirements.txt

* WIP

* WIP

* WIP

* WIP

* Updated researcher doc

* WIP

* Update index.rst

* Should work with other versions, just that we don't build wheels

* Update quickstart guide

* Update developer guide

* Update researcher guide

* Update developer guide

* fixed step numbering

* add announcement to docs

* Updated styling

* separate announcement from conf file

* Styling changes

* Updated install guide

* Update docs

* remove pypi from docs

* Updated foodrecce example

* Updated guides and index

* update api reference

* Update install

* Update docs

* clean up

* Change api and contributors guide order

* shortened official site label

* Updated developer guide

* Lightened dark primary color

* Added tutorials, examples links to github repo

* clean up

* clean up

* clean up

* Remove duplicate index

* re-organize hyperopt

* minor changes

* update install from github source

* revise quickstart

* update install from source

* revise developer guide

* minor changes

* revise researcher guide

* minor changes

* revise foodrecce example

* minor changes

* Add link to GitHub

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Co-authored-by: tqtg <tuantq.vnu@gmail.com>