.env for root URL behavior+plausible #6193

[Hybes]

What does this PR do?

Adds 2 .env variables for Self Hosted Plausible URL, as well as root url to redirect users if they access the booking url without a session, this could be set to a particular users booking page, or to a landing page.

Fixes #6193

Environment: Staging(main branch) / Production

Type of change

• [✓ ] New feature (non-breaking change which adds functionality)
• [ ✓] This change requires a documentation update

How should this be tested?

Configure the two new .env variables:

PLAUSIBLE_URL ROOT_REDIR_URL

• You can see that traffic now sends to the self hosted Plausible URL, though you must include the full URL address, including the .js file.
• If you access the main WEBAPP_URL now without a session (incognito works), you should see you get redirected to the specified site.

Checklist

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[Hybes]

updated to use env variables, not already in use, and to set default plausible URL

[PeerRich]

@Hybes we're probably moving all the app settings into a database to not overload our .env

our goal is to have as little .env variables as possible and adding each app-settings into it doesn't seem like a good idea.

will keep this open but we're likely not merging it in this state -- instead we'll implement an "App Manager" where you can change the settings per instance