Overhaul Readme

[qubist]

Overhaul Readme for modern installation process.

Changes

• Add up-to-date install section
• Add sections (Background, Install, Usage, Gallery, Contributing, License)
• Remove a lot of the text from @dps's blog post, but added link to it!
• Resize images and added title text
• Add swipe-to-scroll instructions for rM2

TODO:

• Update some screenshots (esp. wrt. keyboard)
• Add development instructions
• Add offline reading setup instructions

[qubist]

⚠️ A few FIXMEs left in the file:

• How do I set up my development toolchain for this app?
• How do I set up offline reading after installing from toltec?

@dps can you help with these?

[qubist]

Suggested label: documentation

[qubist]

This PR, if accepted, will close #20

[dps]

• How do I set up my development toolchain for this app?
  Install qtcreator and the reMarkable toolchain (which is no longer available from remarkable.engineering. I have an old copy I have dowloaded when it was available - do you know what the current method to access it is - I presume other toltec packages use it?).
  If you look at https://github.com/dps/remarkable-keywriter/blob/master/.circleci/config.yml you can see how I'm making this available for the continuous build on another package, but I don't want to be the official source.

• How do I set up offline reading after installing from toltec?
  Download the file you want from https://dumps.wikimedia.org/other/kiwix/zim/wikipedia/ and copy it to your reMarkable with scp

[dps]

https://dumps.wikimedia.org/other/kiwix/zim/wikipedia/wikipedia_en_all_nopic_2022-01.zim is the "best" current full wikipedia (with no images) for folks installing from toltec

[qubist]

Thanks for these comments!

toolchain

I'll try to look into either including a link to a resource or compiling instructions myself.

Download the file you want from https://dumps.wikimedia.org/other/kiwix/zim/wikipedia/ and copy it to your reMarkable with scp

Sweet! Where in the filesystem of the reMarkable does remarkable-wikipedia look for it?

[qubist]

This PR, if accepted, will close #24

[qubist]

I think this is ready for review and merge, aside from four FIXMEs left in the file which need input, perhaps from @dps