More intricate dependency control

[CasperWA]

Closes #95

Implement single dependency control based on the ignore config option from Dependabot.

This furthermore updates the Python API (and subsequently the folder structure under the tests/ folder.
Splitting up the individual tasks into individual files under a tasks directory.

[codecov-commenter]

Codecov Report

Merging #99 (c37eefb) into main (5ba72a6) will increase coverage by 11.98%.
The diff coverage is 65.87%.

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@@             Coverage Diff             @@
##             main      #99       +/-   ##
===========================================
+ Coverage   53.69%   65.67%   +11.98%     
===========================================
  Files           3        9        +6     
  Lines         311      472      +161     
===========================================
+ Hits          167      310      +143     
- Misses        144      162       +18     

Impacted Files	Coverage Δ
ci_cd/tasks/docs_index.py	23.33% <23.33%> (ø)
ci_cd/tasks/setver.py	23.52% <23.52%> (ø)
ci_cd/tasks/api_reference_docs.py	65.41% <65.41%> (ø)
ci_cd/utils.py	69.76% <69.76%> (ø)
ci_cd/tasks/update_deps.py	81.09% <81.09%> (ø)
ci_cd/exceptions.py	100.00% <100.00%> (ø)
ci_cd/tasks/__init__.py	100.00% <100.00%> (ø)

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[francescalb]

With the renaming here, I find it hard to see what are the real changes from before and what are the tests for those. It would be useful to go through it together.

[CasperWA]

With the renaming here, I find it hard to see what are the real changes from before and what are the tests for those. It would be useful to go through it together.

To make this more parseable and reviewable, I have split this up into 3 PRs.
This PR will be closed in favor of implementing those PRs.