Delete referenced docs and update README

[rtrieu]

What does this PR do?

• Deletes referenced docs that already exist in the documentation repo
• Updates readme to include reference links

Motivation

Needed as part of un-single-sourcing Android docs: DOCS-5249.

Additional Notes

Anything else we should know when reviewing?

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 #1376 (a59dc21) into develop (c1fb449) will decrease coverage by 0.12%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1376      +/-   ##
===========================================
- Coverage    81.93%   81.82%   -0.12%     
===========================================
  Files          363      363              
  Lines        13014    13014              
  Branches      2187     2187              
===========================================
- Hits         10663    10648      -15     
- Misses        1686     1700      +14     
- Partials       665      666       +1     

see 16 files with indirect coverage changes