Upgrade versions, free from GitHub Pages constraints #75
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Description & Motivation
As a follow-on to #74, now that we are not constrained to using versions that GitHub Pages allows for their automatic stuff, this PR upgrades versions (especially of Jekyll) to more recent versions and eliminates a bunch of unnecessary dependencies.
There are some deprecation warnings originating from the minimal-mistakes package, but that's ok (for now).
Related Issue(s)
N/A
Testing
Tested on my fork
Backwards-compatibility
No
Documentation
No