chore: point repo/registry URLs at git.b1fr0st.eu (Forgejo->Gitea migration)

- Welcome.tsx REPO_URL (footer link) — takes effect on next image rebuild
- README clone URLs, docs/self-hosting.md image ref
- docker-compose.selfhost.yml image refs

README.md

@@ -40,7 +40,7 @@ You need [Docker](https://docs.docker.com/get-docker/) with the Compose plugin.
 **1. Get the files and run the installer:**
 
 ```sh
-git clone https://forge.b1fr0st.eu/peter/siftlode.git
+git clone https://git.b1fr0st.eu/peter/siftlode.git
 cd siftlode
 ./install.sh          # Windows (PowerShell):  ./install.ps1
 ```
@@ -66,7 +66,7 @@ for the full walkthrough.
 Prefer to build the image yourself instead of pulling it:
 
 ```sh
-git clone https://forge.b1fr0st.eu/peter/siftlode.git
+git clone https://git.b1fr0st.eu/peter/siftlode.git
 cd siftlode
 cp .env.example .env
 # generate the two secrets and paste them into .env: