Adopt the Xanadu Sphinx Theme

[Mandrenkov]

Context:

Currently, all Xanadu OSS projects include their own version of the Xanadu Sphinx theme; however, the Xanadu Sphinx Theme repository is now publicly available and is the preferred way to access the Xanadu CSS theme and Sphinx directives.

Description of the Change:

• Deleted the docs/xanadu_theme directory.
• Updated docs/requirements.txt and docs/conf.py to reference and use the (centralized) Xanadu Sphinx Theme.

Benefits:

• The size of this repository is smaller, meaning git clone will run faster.
• Updates to the Xanadu Sphinx theme no longer have to be manually ported to this repository.

Possible Drawbacks:
None.

Related GitHub Issues:
Depends on XanaduAI/xanadu-sphinx-theme#2 and implements [sc-17452].

[codecov]

Codecov Report

Merging #126 (e887391) into main (0fe12a3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #126   +/-   ##
=======================================
  Coverage   68.69%   68.69%           
=======================================
  Files          26       26           
  Lines        2734     2734           
=======================================
  Hits         1878     1878           
  Misses        856      856           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0fe12a3...e887391. Read the comment docs.

[ziofil]

cool! How do I visualize the changes? Do I need to compile the docs?

[Mandrenkov]

cool! How do I visualize the changes? Do I need to compile the docs?

Yeah, exactly! Just install doc/requirements.txt and friends, run make html in the Sphinx documentation directory, and open doc/_build/html/index.html in your favourite browser. There may also be a way to get Read the Docs to build it for you.

[thisac]

💯