Add snapshot-revert proposal

Signed-off-by: David Scott <dave.scott@citrix.com>
Snapshot references: add navbar and prototype code references

Signed-off-by: David Scott <dave.scott@citrix.com>
Merge pull request #23 from djs55/snapshot

Add snapshot-revert proposal
Add missing YAML data to snapshot-revert proposal

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>
Create index page for design proposals

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>
Move design_docs HTML to a template

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>
Link design docs index in nav bar

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>
Move existing design docs under new index

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>
Change YAML for design docs

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>
Syntax highlight the YAML in the README

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>
Add instructions for contributing design proposals

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>
Labels can be empty, they're handled by the :empty selector

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>
Use colour-coded labels in design docs index

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>