Update Unraid instructions to v0.5.x

[Styloy]

this updates the Unraid Install instructions and also fixes a few links that I've spotted in the process.

[bbilly1]

Nice! Thanks for taking the time. It gives me notice for some broken links:

INFO    -  Building documentation...
INFO    -  Cleaning site directory
INFO    -  Doc file 'installation/unraid.md' contains an unrecognized relative link '../installation/env-vars/#ta_host', it was left as is. Did you mean 'env-vars.md#ta_host'?
INFO    -  Doc file 'installation/unraid.md' contains an unrecognized relative link '../settings/actions/#manual-media-files-import', it was left as is. Did you mean
           '../settings/actions.md#manual-media-files-import'?
WARNING -  Doc file 'installation/unraid.md' contains a link '../assets/unraid_redis_port.png', but the target 'assets/unraid_redis_port.png' is not found among documentation files.
INFO    -  Documentation built in 0.35 seconds
INFO    -  [22:10:59] Watching paths for changes: 'docs', 'mkdocs.yml'
INFO    -  [22:10:59] Serving on http://127.0.0.1:8000/
WARNING -  [22:11:01] "GET /installation/assets/unraid_redis_port.png HTTP/1.1" code 404
INFO    -  [22:11:01] Browser connected: http://localhost:8000/installation/unraid/

You can get it when you run the dev server from the "mkdocs" folder with mkdocs serve.

It's not always correct when it complains, but usually it is, in my experience. :-)

[Styloy]

hopefully that fixes the relative links.

[Styloy]

Just checking in on this, can you see if mkdocs is happy with those changes now?

[bbilly1]

Nice, looks good now.