externalize MPVTemplate

[bitte-ein-bit]

Solves https://github.com/navidrome/navidrome/discussions/2875

Useful for e.g., snapcast integration

[deluan]

Thanks for this. Can you please add some instructions about this in the website?

[github-actions[bot]]

Download the artifacts for this pull request:

• js-bundle.zip
• binaries.zip

[bitte-ein-bit]

@deluan added some documentation in https://github.com/navidrome/website/pull/157