Update begginer's guide

[kaelyndunnell]

…a git account is not needed for latest updates of the code.

Proposed changes

Describe the big picture of your changes here to communicate to the maintainers why we should accept this pull request. If it fixes a bug or resolves a feature request, be sure to link to that issue.

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

Checklist

• Black formatted
• Unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[kaelyndunnell]

Fixes issue #839

[RemDelaporteMathurin]

Thanks @kaelyndunnell for this! I pushed one commit to:

• avoid using my personal fork link (RemDelaporteMathurin) instad of festim-dev
• use the direct reference to the section instead of a URL. That's because if we look at a version of the docs that is not stable (say fenicsx) then this link will always get to the stable version of the docs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.55%. Comparing base (6ec0543) to head (ebc3168).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #915   +/-   ##
=======================================
  Coverage   99.55%   99.55%           
=======================================
  Files          60       60           
  Lines        2717     2717           
=======================================
  Hits         2705     2705           
  Misses         12       12           

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