Update "Learn more" link

[bmarty]

Content

To be reviewed commit per commit.

• update link 83038ae
• other commit: renaming and cleanup.

Motivation and context

Closes #4684

Screenshots / GIFs

Tests

• Login to a session
• When the verification flow starts, click on Learn more.
• The page https://element.io/help#encryption-device-verification should load.

Tested devices

• Physical
• Emulator
• OS version(s):

Checklist

• Changes have been tested on an Android device or Android emulator with API 24
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request title will be used in the release note, it clearly define what will change for the user
• Pull request includes screenshots or videos if containing UI changes
• You've made a self review of your PR

[github-actions]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

Attention: Patch coverage is 91.80328% with 5 lines in your changes missing coverage. Please review.

Project coverage is 80.11%. Comparing base (390337c) to head (686d9a1).
Report is 10 commits behind head on develop.

Files with missing lines	Patch %	Lines
.../outgoing/DefaultOutgoingVerificationEntryPoint.kt	0.00%	3 Missing ⚠️
...ion/impl/outgoing/OutgoingVerificationPresenter.kt	95.23%	0 Missing and 1 partial ⚠️
...ysession/impl/outgoing/OutgoingVerificationView.kt	90.90%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #4686   +/-   ##
========================================
  Coverage    80.11%   80.11%           
========================================
  Files         2126     2126           
  Lines        56270    56273    +3     
  Branches      7014     7014           
========================================
+ Hits         45081    45084    +3     
  Misses        8778     8778           
  Partials      2411     2411           

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