Improve /neutrinet webpage

1. The links are now in bold. This isn't a typical thing to do, so it's not intuitive. These should be either another colour or underlined. Since Neutrinet doesn't really have a 'main' colour, I'd use underlined instead of bold.
2. There is Javascript loaded which isn't used. It looks like this was part of a framework-like thing together with the css. The Javascript should be removed.
3. Add a translations for Dutch. The prefered way is probably to have a second page for Dutch and a link on the pages to switch from fr to nl. The default an remain fr.
   • If this proves too difficult, maybe it can be easier to have both translations on one page (but let's try to not go this way).
   • If this doesn't prove to be difficult enough, we can also see if we can have nginx load the nl/fr page in case nl/fr preference is detected from the browser. Fr should still be default.