Make path prefix configurable

[GabenGar]

Currently hardcoding works but it should instead pull this value from environment variable, preferably from github pages job.

[GabenGar]

Reference articles:

• https://vitejs.dev/guide/env-and-mode.html
• https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/store-information-in-variables