[#76253826] update left navigation HTML
[#76253826] make sidebar affix and scroll spy it
[#76253826] udpate top page and some refactoring
[#76253826] update affix for docs sidebar
[#76253826] udpate sidebaf affix position
[#76253826] udpate grunt build gengo.css file
[#76253826] update editable text javascript examples
[#76253826] udpate forms examples
Merge pull request #52 from gengo/76253826-cleanup

[#76253826] Cleanup
Travis build 251