Rewrite "Getting Started", link to CONTRIBUTING.md
Clarify first step of "How to submit code"
Merge pull request #2213 from openjck/contributing-first-step

Clarify first step of "How to submit code"
Merge pull request #2212 from openjck/readme-contributing

Rewrite "Getting Started", link to CONTRIBUTING.md
fix bug 937634 - Prevent icon issues on small screens