Feature Request: Improve Landing Page

[redmunds]

@jbalsas These are the notes from the e-mail conversation we had.

• Custom content with Resource Links
• Embed README.md or CONTRIBUTING.md?

What other resource links might be helpful?

• Annotating JavaScript for Closure Compiler
• Coding Conventions doc?
• How to Hack on Brackets wiki page?
• LICENSE.md?
• Wiki?
• Required repos: brackets-shell?
• Submodules: CodeMirror, jstree, etc.?
• Libraries: jQuery, LESS, etc.?