docs: Re-generate the index.* files

The generation logic has been changed so that license entries in
`index.html`, `index.json` and `index.yml` are ordered alphabetically
by their (license) key. Re-generate the index files to apply the new
order.

[1] `make clean build`

Signed-off-by: Frank Viernau <[email protected]>

Author: fviernau