[ dergigi/boris ] fix: relay article link now opens via /a/ path instead of /r/

Updated handleLinkClick in PWASettings to check if URL is an internal

route (starts with /) and navigate directly, otherwise wrap external

URLs with /r/ path. This fixes the third relay education link to open

the nostr article correctly.

https://github.com/dergigi/boris/commit/033ef5e995402a619a0d7dc037e23248cbddde04