This adds the do not disturb button to the left sidebar
which disables sound and notifications. It also disables
flash taskbar on windows.
Fixes: #298.
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 updated the setting page if the sidebar was toggled using a shortcut.
This also updates the setting page if the tray was toggled using menu.
Fixes: #304.
Settings are initialized only when user clicks on General/Server/Network section settings
In case, user doesn't visit these section, those values set to be null automatically.
This fix makes sure the default settings are correctly set to either true or false.
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.
