Replace Mobile Vitals image, update text and links

[rtrieu]

What does this PR do?

Updates the Mobile Vitals screenshot and text to match the new UI.

Motivation

DOCS-4882

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 #1334 (adf9c04) into develop (a2488e4) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1334      +/-   ##
===========================================
- Coverage    81.90%   81.86%   -0.04%     
===========================================
  Files          362      362              
  Lines        12903    12903              
  Branches      2164     2164              
===========================================
- Hits         10568    10563       -5     
- Misses        1679     1683       +4     
- Partials       656      657       +1     

see 11 files with indirect coverage changes

[0xnm]

lgtm, but it seems new image is missing in this PR.

[rtrieu]

@0xnm Thanks for noticing that, Nikita. Due to the way our single-sourcing works, screenshots are in a different repo/PR: DataDog/documentation#17276

[0xnm]

Hello @rtrieu ! It seems that this PR is stale, is it still valid?

[xgouchet]

I think this can be discarded as we're planning to remove the docs from the repo anyway

[rtrieu]

Hi @0xnm @xgouchet yes this branch is stale, and we're moving over to the docs repo anyway, so I will close it out. Thanks!