docs: Improve README.md

[frankvonhoven]

Description

Reduce README.md content to focus on building and running the app.

Documentation files linked on Table of Contents.

First iteration just focus on iOS platform.

Related issues

Fixes: https://github.com/MetaMask/mobile-planning/issues/1533

Manual testing steps

Comparisson

main: https://github.com/MetaMask/metamask-mobile/tree/main#readme
improved readme: https://github.com/MetaMask/metamask-mobile/tree/chore/tldr-readme#readme

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I’ve followed MetaMask Coding Standards.
• I've clearly explained what problem this PR is solving and how it is solved.
• I've linked related issues
• I've included manual testing steps
• I've included screenshots/recordings if applicable
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.
• I’ve properly set the pull request status:
  • In case it's not yet "ready for review", I've set it to "draft".
  • In case it's "ready for review", I've changed it from "draft" to "non-draft".

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (542af2c) 41.05% compared to head (de68b2c) 41.05%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8492   +/-   ##
=======================================
  Coverage   41.05%   41.05%           
=======================================
  Files        1247     1247           
  Lines       30371    30371           
  Branches     2965     2965           
=======================================
  Hits        12468    12468           
  Misses      17158    17158           
  Partials      745      745           

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[Cal-L]

left a question

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[sethkfman]

LGTM