CONTRIBUTING doc changes

[0xnm]

What does this PR do?

Minor changes: update of the templates links and Detekt/Ktlint versions used.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.04%. Comparing base (ce17163) to head (0f35539).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2275      +/-   ##
===========================================
- Coverage    70.05%   70.04%   -0.01%     
===========================================
  Files          732      732              
  Lines        27209    27226      +17     
  Branches      4579     4580       +1     
===========================================
+ Hits         19060    19068       +8     
- Misses        6876     6878       +2     
- Partials      1273     1280       +7     

see 27 files with indirect coverage changes