Added Jekyll Functionality
Converted Current IO Page from HTML to Markdown
Fixed Link Issues
Adjusted other webpages
Added More Structure and Temporary Nav System
Added Navigation YML file
Added Legacy, Release YML and tweaked layouts

Tweaked a few areas and added new features.
Changed .gitignore

Removed _site/
Tidy up config and content
Correct links on main index page
Tidy up for merging

- Remove most placeholder text.
- Remove navbar link to blog archives as it's a second level page.
- Add SSM status icons.
- Tidy up contributors lists.
Merge pull request #7 from apel/jekyll_conversion

Jekyll conversion