cleanup directory, html, css, js; remove unused files
fix broken background in force-light theme
Merge branch 'cleanup-dir-html-css-js' of https://github.com/wklaebe/ffmap-d3 into wklaebe-cleanup-dir-html-css-js
Merge remote-tracking branch 'tcatm/master'

diffs remaining:

a0b65f1dd37422014d6eabe7fc45d596b7decb28 use apache2 SSI for Freifunk network name and host
a7b2237e27d7da09a921d8c935b810b2e589504c add nodes/.htaccess, ignore nodes/*.png
3c153327422db98e7dc3dc89b1f16b8b53150d0f add status plot image to node information popup
776c0cc750444079abec18b00c9c9265db85991f double gravity