[#540] Tweaks to main front end docs
[#540] Small tweaks to the docs regarding CSS and HTML info
[#540] Add note and link to module tutorial
[#540] Fixes primer page for references in docs
[#540] Remove old primer snippet
[#540] Fixes for failing front-end JS tests
[#540] Tweaks to frontend root docs
[#540] Add link to the frontend testing doc
[#540] Tweaks to the JS coding standards
[#540] Typo fix