[next] fix(NcRichText): crash on router links rendering

[ShGKme]

☑️ Resolves

• Talk is broken when there is a link to another chat in the chat
• Fix warnings and errors

To test:

1. Checkout https://github.com/nextcloud/spreed/tree/vue3
2. Before linking nextcloud-vue - remove rm -rf node_modules/vue-router from nextcloud-vue repo (or use npm pack instead of npm link)
3. Send a link to another chat in a chat

🖼️ Screenshots

🏚️ Before	🏡 After

🚧 Tasks

• move vue-router from devDeps to deps to externalize it. Otherwise it is built in and we have 2 routers. We should take router from package users, not during the build.
  Fixes:
  
• move vue from peer to deps (no changes, just make it correct)
• use function slot in render
  Fixes:
  

🏁 Checklist

• ⛑️ Tests are included or are not applicable
• 📘 Component documentation has been extended, updated or is not applicable
• 3️⃣ Backport to next requested with a Vue 3 upgrade

[Antreesy]

Tested