Did some work on the family of Nucleus sites today.
- Created placeholders for the documentation, skins and wiki sites, with pointers to the current location of these sites.
- Replaced the plugins website by a similar placeholder. The old plugins site is way outdated and apparently not the best way to handle things. As for the future: either this site will redirect to the plugins section of the Wiki, or this site will become a showcase site.
- Re-organized the forum according to this forum topic.
- Added a navigation bar on all sites (still missing on nucleuscms.org, though) and on the forum. It's an unordered list, controlled by a single stylesheet. This way, when styles need change, only one CSS file needs to be edited. Where possible, sites should also use an include to insert the HTML for the navbar, rather than copy-pasting the HTML code. Same reason: less files to change when something is added/removed.