Minor Github Actions fixes

[JSousa-UoL]

Proposed changes

This PR contains 2 small changes to Github Actions workflows. Indentation of workflow_dispatch in reference_manual.yml was incorrect and Python-CI.yml was renamed to Python_CI.yml so that it's consistent with the others .yml files.

Also, there was an attempt at replacing pep8speaks with an alternative Github Action workflow in draft PR #180. This attempt wasn't successful as some potential security risks were identified. Please consult issue #140 for more details about this. The conclusion is that ukat should keep using pep8speaks as it is.

Checklists

• [x] I have read and followed the CONTRIBUTING document
• [x] This pull request is from and to the dev branch
• [x] I have added necessary documentation (if appropriate)
• [x] I have updated documentation which becomes obsolete after my changes (if appropriate)
• [x] Files added follow the repository structure (if appropriate)

[codecov[bot]]

Codecov Report

Merging #181 (34f42d4) into master (2016d97) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #181   +/-   ##
=======================================
  Coverage   98.97%   98.97%           
=======================================
  Files          34       34           
  Lines        3130     3130           
=======================================
  Hits         3098     3098           
  Misses         32       32           

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