update readmes in services directory

services/caddy/readme.md

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+caddy is a reverse proxy server providing secure access to https-based applications on teal.  Configuration
+
+of the reverse proxy is found in the file /etc/caddy/Caddyfile.
+
+For general information on caddy see [caddy reverse proxy quick start](https://caddyserver.com/docs/quick-starts/reverse-proxy).
+
+```
+
+```

services/gitea/readme.md

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+Gitea is the Git source control server for the network.  For general information on Gitea, see [Gitea Official Website](https://about.gitea.com/)

services/immich/readme.md

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+Immich is a photo backup solution.  For general information on Immich, see [Immich.app](https://immich.app//)

services/jellyfin/readme.md

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+Jellyfin is the home network's media server.  For general information on Jellyfin, see [jellyfin.org](https://jellyfin.org/)

services/mc/readme.md

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+mc provides a Docker-hosted implementation of the JRiver Media Center application.

services/portainer/readme.md

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+Portainer is a web-based management application for Docker containers.  For general information on Portainer, see [Portainer](https://www.portainer.io/)