Documentation guide

[RemDelaporteMathurin]

Proposed changes

Fixes #778 by adding a guide to building the documentation in the docs.

Types of changes

What types of changes does your code introduce to FESTIM?

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Code refactoring
• Documentation Update (if none of the other choices apply)
• New tests

[RemDelaporteMathurin]

@KulaginVladimir do you think there's anything I missed here?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.53%. Comparing base (36da67b) to head (94fccf1).
Report is 167 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #779   +/-   ##
=======================================
  Coverage   99.53%   99.53%           
=======================================
  Files          59       59           
  Lines        2577     2577           
=======================================
  Hits         2565     2565           
  Misses         12       12           

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