Stop using sharp at runtime

- Generate icons at build time, don't commit them as they are binary
  files

Signed-off-by: Sebastian Malton <sebastian@malton.name>

.gitignore

@@ -8,6 +8,7 @@ locales/**/**.js
 lens.log
 static/build
 static/types
+build/tray/
 binaries/client/
 binaries/server/
 src/extensions/*/*.js