Adding new commotion-router developer's guide
Very basic developer overview of commotion-router and packages
Added prerequisites and link to github workflow
Added basic android developer resources
Fixed outdated dev resource links
Added build-from-source link to commotion-router download page
updated new links on developer/resources- should be to relative directories for index pages, or to 'index.html' in that directory, not index.md. Also added sub_section front matter variable and sub-menu for new developer resources pages and added logic to the developers_menu.html include to provode the sub-menu for this sub section.
Merge pull request #56 from opentechinstitute/developer-resources

Updated Developer Resources & Downloads for 1.1