chore: Improve codebase and other changes

[TheRealKeto]

The following changes were made

• Use f-strings over object + "string": don't do this
• Remove Python byte-compiled code; it's ignored by Git now
• Remove useless requirements: they're already part of Python!
• Improve PackageLister: use Path over os module

Also, the repo should be labeled as a template

[Shugabuga]

I would have to do regression testing but this look sound.

Silica was written ages ago by now and I have definitely grown since then. As for the future of Silica as a tool, CI/CD is something I do want to look into, as is better integrations into Actions for Pages deploys, because that's now a thing! But also, jailbreaking is on the decline, so I do have to triage whether there still is demand (I am thinking to resume maintenance, based on its popularity).

As for whether this should be a template repo: I lean on "no" because Silica is ultimately a tool, not a template. It's philosophically more related to create-react-app and Jekyll than traditional boilerplates (especially other repo templates).

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For those wondering why I've been AWOL: tl;dr is university.