Version 0.1.4 release

Major Changes:

 - New users now see a "welcome" screen which provides some brief usage explanation while highlighting the relevant buttons
 - There is a brand new CSS color system, zebra, which defines contextual foreground/background colors. It is similar to the rhino system (which handles sizing)
 - All buttons now use a consistent visual language in terms of hover/active/focus/disabled state
 - Use of mat-icon has been completely removed in favor of server-provided SVGs
 - Server now sends JSON and javascript in gzip which leads to much faster page load times

Minor Changes:

 - All editable text/date elements now show a hover outline
 - All uploaded photos now generate thumbnails in the background (not used yet though)
 - CSS page layout classes have been simplified
 - On hotkey screen, currently disabled actions are shown in grey.
 - Icons are slightly larger in most contexts.

Bug Fixes:

 - plant name column no longer resizes when edited with one plant on table
 - clicking on already-present search filter no longer triggers a new search
 - fixed bug where previously used key bindings could not be rebound
 - actions which could not correctly have been triggered by hotkeys no longer appear on hotkey selector
 - delete actions for top-level items can now be triggered by hotkeys
 - fixed bug where photo navigation hotkeys didn't work