[Feature]: Feedback from Roland regarding the documentation

[kpanot]

Context

For the release of the Otter v10, we received feedback from Roland who did a quick review of the Otter repository documentation.

Proposal

Summarize of the feedbacks:

• [x] The links labeled "here" in the main readme should have a label more explicit
• [x] Missing @o3r/telemetry package in the /docs/readme.md package list
• [ ] Architecture schema is to big to be read on github interface, it should be split or find a better way to display it
• [x] Missing interconnection between the showcase different pages
• [x] Provide documentation regarding issue that can appear we npm/yarn is used behind a proxy
• [ ] The main readme ToC could include /docs/ documentation nativation
• [ ] The main readme could include testimonials from users
• [x] Add badges to main readme and module readme files
• [ ] Change the /docs/ folder structure as following

     |-- migration-guides (moved from top level to docs)
      |-- units
              |-------ab-testing
              |-------analytics
             ….
     |-- contributing.md (moved from top level to docs)
     |-- security.md (moved from top level to docs)

• [x] Update SECURITY.md with the latest versions
• [x] Reduce the number of tsconfig.*.json file at root level

[kpanot]

The point Reduce the number of tsconfig.*.json file at root level is handle at IDE level via the VsCode's fileNesting feature.