update PORTAL_HA docs
mention info.json is no longer necessary
remove references to info.json
small api doc updates
mention prehashed signatures in Minisign
no longer need "wg genkey / wg pubkey"
no longer set PHP's session/cookie params
call generate-secrets
generate WireGuard key
more on guest usage
small updates to ROADMAP
link to our own WireGuard document
update WIREGUARD documentation
more useful instructions for fetching fedora 35 image