Replaces the long bash script with a even longer XML file, along with an
XSD, and two XSLTs to convert the file into the bash script and into an
OPML file.
Another XSLT is still needed for the index page, but that's less urgent.
Reviewed-on: #56
Co-Authored-By: lucidiot <lucidiot@protonmail.com>
Co-Committed-By: lucidiot <lucidiot@protonmail.com>