Exclude CUSTOMISATIONS.md from being built.
Rejiggered code to stop images bleading into next article.

This provides better looking headers, and a couple of utility
CSS classes.
Add attract_image feature.
Added dedicated _doc directory
MUCH nicer looking recent posts.
Add thedaywefightback.org functionality. (Disabled by default)

See https://thedaywefightback.org/ for details.
See `_config.yml.example` for sample config, or add:

    thedaywefightback:
        enable: true
        testing: false

to your `_config.yml` file.  (Setting `testing` to true will
show the banner even if it's not Feb 11, which is useful for
a local `jekyll serve` to make sure it renders properly.)
Fix typos, speeling mistakes, and docs. No functional changes.