Organize, add comments  and theme settings, remove unneeded settings

Watch out for the RELATIVE_URLS setting while testing!
Remove the RELATIVE_URLS setting and use the Pelican default (True)
Merge remote-tracking branch 'raywan/update-settings'

Conflicts:
	pelicanconf.py
Manual merge of https://github.com/nairobilug/nairobilug.or.ke/pull/60

This kinda stuff is a pain to work with when using multiple remotes
with rebasing and merging etc... so just merge manually for great
justice.

Signed-off-by: Alan Orth <alan.orth@gmail.com>
theme: Update to latest theme commit

Signed-off-by: Alan Orth <alan.orth@gmail.com>