Build: Improve Saucelabs testing

Switch from the Mocha reporter to the custom one that handles mocha better ...
Still encountering random errors, but pass rate is higher using the JS API.
- Changed concurrency to the new throttled option
- Bumped Expect.js, which also removes a package.json warning
- Bump Mocha to latest
- Bump Sinon to latest
Fixed the logo size for the splash page in IE
Merge pull request #5293 from LaurentGoderre/fix-splash-logo-ie

Fixed the logo size for the splash page in IE
Merge pull request #5284 from nschonni/saucelabs-5

Build: Improve Saucelabs testing
Documentation/Accolades: Fixed and removed broken links.
Merge pull request #5298 from EricDunsworth/v4.0-broken-link-fixes

Documentation/Accolades: Fixed and removed broken links.