Changes -
* New setting nav item for connected organizations.
* All new page for adding a new server.
* Minor UI changes in setting page.
* Update default height, width of the main window.
* Fix webview showing outline.
* Hide Server nav item in setting page.
Fixes#340.
This is the initial pass at adding keyboard shortcuts to the Settings page. In
this commit, the `ShortcutsSection` class has been created and is applied to a
newly-added 'Keyboard Shortcuts' nav item. The template for ShortcutsSection
is essentially multiple settings cards containing one table of keyboard short-
cuts organized by their underlying functionality.
The HTML `<kbd>` tag was defined in preference.css which styles the element to
look like a keyboard key, similar to StackOverflow or GitHub.
