move cloud service documentation to the options page

[christian-bromann]

Proposed changes

Some documentation improvement on cloud service usage.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

Reviewers: @webdriverio/technical-committee

[codecov]

Codecov Report

Merging #3909 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3909      +/-   ##
==========================================
+ Coverage   98.54%   98.57%   +0.02%     
==========================================
  Files         153      153              
  Lines        3435     3437       +2     
  Branches      749      750       +1     
==========================================
+ Hits         3385     3388       +3     
+ Misses         45       44       -1     
  Partials        5        5

Impacted Files	Coverage Δ
packages/wdio-runner/src/index.js	97.75% <0%> (+1.2%)	⬆️

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