appview/pages: add knots description to /knots
Provide an explaination to what a Knot is. Pulled from the introducing
tangled blog post. Addsd a link to the self hosting documentation in
core. Removes additional padding to be more consistent with the other
setting pages.
Signed-off-by: Ciel <jamie@longest.voyage>
authored by
ok-ciel.bsky.social
and committed by