Working header links, current facts, and a footer

.ncm

Working header links, current facts, and a footer

Changes

Fixed
Guide opens the .ncm guide, and npm opens the @nuucognition/ncm package. Before, the header links went nowhere.
Removed
The Spec link. No spec page is published yet.
Fixed
The block count is 29, the size of the block registry today.
Fixed
The Themes slide shows the two themes of NCM UI, nuu and paper. The three old presets do not exist.
Changed
The version badge shows beta 0.1.1, the current release on npm.
Added
A footer with links to NUU Cognition, NUU Mesh, the changelog, Suggest an idea, and Report a bug.
All updates of .ncm
Working header links, current facts, and a footer · .ncm