Add a template Software section

Issue #6.
Standardise the page link headers

Eache page title header contains:

  - Blog (open in new window)
  - Music
  - Software
  - Pictures
software: Correct header link
software: Add some placeholder content

Issue #6.
assets/css: Add a site-wide template page

This is an attempt to unify the site's style-pages into a single common
template, reducing the amount of cross-page duplication.
genetics: Port to site style
genetics: Remove unused code
gen-regions: Port to site style
music: Port to site style
software: Port to site style
pictures: Port to site style
assets/css: Remove static-700 style sheet

It has been replaced with site.css
genetics: Use a fixed width container for canvases
software: Add more contents

Closes #6.
assets/site.css: Reduce top padding
assets/site.css: Add fixed width container
gen-regions: Place canvas in fixed width container
pictures: Use thumbnails style from site.css
pictures: Merge styles into site style.css
Merge branch 'iss6'