Major content updates
Major code update.

Switch to new ufront routing/controllers.
Improvements to manual import, pages navigation.
In APIs, return simple values and throw errors, rather than return Outcome<Success,Failure>.
Minor fixes
Fix dependencies, delete old latexparser code
Moved assets into out/, no need to keep them separate anymore
Add deploy.json, update gitignore
Remove unnecessary traces and commented out code
Get manual images working
Use `www` instead of `out`

Now that assets are stored in there, it's not just output, so `www` seems more appropriate.
Moved views out of uf-content
Put links on feature name, rather than separately at end
Add prev/next links for most pages on the site.

Only work within sections, not between sections...
Add API zip downloads
Added documentation landing page
Redirect for community homepage
Add extra text, make icons links
Fix anchor links / margins on std lib introduction page
Fix links, fix typo on homepage
Tweak prev/next link positions and margins
Add "who uses haxe", update companies and logos