Updates GitHub issue template: (#1473)
Updates GitHub issue template: (#1473)

- Removes request for OS/version
- Adds links to new experiments
6a68/testpilot,clouserw/testpilot,dannycoates/testpilot,6a68/idea-town,meandavejustice/testpilot,mathjazz/testpilot,fzzzy/testpilot,mozilla/idea-town,lmorchard/testpilot,flodolo/testpilot,flodolo/testpilot,dannycoates/testpilot,lmorchard/idea-town-server,flodolo/testpilot,fzzzy/testpilot,6a68/idea-town,mozilla/testpilot,mozilla/idea-town-server,meandavejustice/testpilot,chuckharmston/testpilot,6a68/idea-town,meandavejustice/testpilot,flodolo/testpilot,meandavejustice/testpilot,clouserw/testpilot,mozilla/testpilot,lmorchard/testpilot,chuckharmston/testpilot,mozilla/idea-town-server,lmorchard/testpilot,dannycoates/testpilot,lmorchard/idea-town-server,mathjazz/testpilot,lmorchard/idea-town,lmorchard/idea-town-server,clouserw/testpilot,clouserw/testpilot,lmorchard/testpilot,mathjazz/testpilot,6a68/testpilot,fzzzy/testpilot,lmorchard/idea-town,mozilla/idea-town,6a68/testpilot,mozilla/idea-town,lmorchard/idea-town,fzzzy/testpilot,6a68/idea-town,mozilla/idea-town-server,mozilla/idea-town-server,chuckharmston/testpilot,6a68/testpilot,mozilla/idea-town,lmorchard/idea-town-server,dannycoates/testpilot,mozilla/testpilot,lmorchard/idea-town,mozilla/testpilot,chuckharmston/testpilot,mathjazz/testpilot