Fix typo in README.md

Removed extra "is" from first sentence under Hack header.
[desktop] Never hide toolbar in non-zen mode
[desktop] Move show-toolbar and toolbar to top in zen mode

To minimize mouse movement.
[desktop] Add editor padding-top
Fix #198
Merge pull request #201 from twiss/desktop

Toolbar on the desktop
Fix toolbar jumping around in Chrome
Merge pull request #250 from codexa/issue-198

Fix #198
Merge branch 'patch-1' of https://github.com/brndnb/firetext into brndnb-patch-1
Merge branch 'brndnb-patch-1' into develop
Move styles in editor.html to external file
Merge pull request #257 from twiss/chrome-fix-toolbar-jumping

Fix toolbar jumping around in Chrome
Merge pull request #262 from twiss/module-styles

Move styles in editor.html to external file
Added Gitter badge
Merge branch 'gitter-badger-gitter-badge' into develop
Generate complete html files