🐛 Fix some code locations that should probably use BASE_URL

[nealian]

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Category:
Bugfix

Overview
A smol change to allow dashy to be fully run in a non-root (URL) context, such as https://example.com/cool-apps/dashy (as opposed to, say, https://dashy.example.com), with all resources being loaded from that context.

Issue Number #857

Code Quality Checklist (Please complete)

• All changes are backwards compatible
• All lint checks and tests are passing
• There are no (new) build warnings or errors
• (If a new dependency is added) Package is essential, and has been checked out for security or performance
• (If a new config option is added) Attribute is outlined in the schema and documented
• Bumps version, if new feature added

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[viezly]

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[nealian]

Welp, this is only enough to do the job (and then only mostly; the call to save the configuration is still busted, as is a font load) if BASE_URL ends in a /, and I think the loading screen only works there if routingMode is set to hash.
So I'm missing a few things here; I'll come back tomorrow with more (and will more thoroughly test first 😅)
Edit: upon further review of the Vue docs, it is common to require BASE_URL to end in a /, so that is now reflected here.

[nealian]

This has quickly become a spam-fest / game of whack-a-mole / yeah I don't 100% know what I'm doing here -- and I'd rather take the time to figure it out properly. And then squash my commits. Sorry 😅