A collection of changes

[loops]

Hi, I was unsure whether to submit just one PR, or one-for-each small change. If you prefer them broken up into multiple PRs, just say so.

• Add option to ignore hardware repeat events
• Add abiity to execute a given alias at startup
• Add a README on how to convert .adoc to .html
• Add a cfg_sample for learning the Colemak layout
• Add --quiet command line option

Full disclosure: Even though Mac and MSwin are mentioned in passing, I've only compiled and tested these on Linux.

Checklist

• Add documentation to docs/config.adoc
  • [ ✔️] Yes or N/A
• Add example and basic docs to cfg_samples/kanata.kbd
  • [✔️ ] Yes or N/A
• Update error messages
  • [ ✔️] Yes or N/A
• Added tests, or did manual testing
  • [ ✔️] Yes