Remove redundant docs

[0xnm]

What does this PR do?

This change remove files which were moved to the https://github.com/DataDog/documentation repo. Edits made since then are moved in PR DataDog/documentation#18936

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

Merging #1540 (7e93a65) into develop (efac9da) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1540      +/-   ##
===========================================
- Coverage    83.45%   83.41%   -0.03%     
===========================================
  Files          438      438              
  Lines        14867    14867              
  Branches      2239     2239              
===========================================
- Hits         12406    12401       -5     
+ Misses        1879     1874       -5     
- Partials       582      592      +10     

see 10 files with indirect coverage changes

[aliciascott]

Docs card for review https://datadoghq.atlassian.net/browse/DOCS-5878

[rtrieu]

Looks good! Thanks for this PR.