Remove Javascript files and related elements from HTML/CSS

[Luke McKinstry]

#216 moves jkan to use HTML & CSS only without Javascript. That PR disables JS by blocking it from being loaded into the site in _includes/footer.html.

This issue is to:

1. remove the actual JS files from the codebase, located in ./scripts/src/
2. clean up the html & css in the codebase by removing attribute tags, css elements, etc. that are in there for the JS to use (eg. to show or hide the section of html)
3. update the Architecture wiki to reflect changes to the site. Most notably the Javascript section can be largely removed.