Merge pull request #301 from gvwilson/blog

Adding news from the UK, and fixing title of DiRAC dry run post
Adding blog post to announce registration for Amsterdam
Colour, font, and small layout changes to improve readability

- Base text font face changed for readability
- Text and heading colour changed to different greys
- Align blog text with heading
Updated upcoming office hours and updated description a little.

- I removed the implicit requirement to have attended a bootcamp (since Rosalind people may be coming by).
- I changed the image to show where to click.  Perhaps this isn't even necessary.
Added myself to metadata
Merge pull request #303 from pipitone/office-hours-update

Updated upcoming office hours and updated description a little.
Merge pull request #302 from amyrbrown/blog-amsterdam

Adding blog post to announce registration for Amsterdam
Merge pull request #290 from pipitone/typography-tweaks

Colour, font, and small layout changes to improve readability
Blog post about Melbourne
Merge branch 'master' of github.com:swcarpentry/website into blog
Fixing dangling HTML tag in office hours page