Mirage theme and bunch of fixes

• 🎨 💄 [NEW] Mirage theme 👻
  activate with

    "theme": "ayu-mirage.sublime-theme",
    "color_scheme": "Packages/ayu/ayu-mirage.tmTheme",

• [NEW] build system

• [NEW] Reduced most of the assets

• Renamed ayu-dark
  use following settings for dark theme:

    "theme": "ayu-dark.sublime-theme",
    "color_scheme": "Packages/ayu/ayu-dark.tmTheme",

• Fix for issue with cut tab labels

• Fix for issue with sidebar labels