Remove theme manager in favour of webassets

gallery/themes/default/components/elements/notification.sass

@@ -1,131 +0,0 @@
-@mixin notification($color)
-    color: RGB($color)
-
-    .sniffle__notification-time
-        background-color: RGB($color)
-    
-.notifications
-    margin: 0
-    padding: 0
-
-    width: 450px
-    height: auto
-
-    position: fixed
-    top: 0.3rem
-    right: 0.3rem
-
-    display: flex
-    flex-direction: column
-
-    z-index: 621
-
-.sniffle__notification
-    margin: 0 0 0.3rem 0
-    padding: 0
-
-    width: 450px
-    height: auto
-    max-height: 100px
-
-    display: flex
-    flex-direction: row
-
-    position: relative
-
-    background-color: RGB($bg-300)
-    border-radius: $rad-inner
-    color: RGB($fg-white)
-    opacity: 0
-    transform: scale(0.8)
-
-    box-sizing: border-box
-    overflow: hidden
-
-    transition: all 0.25s ease-in-out, opacity 0.2s ease-in-out, transform 0.2s cubic-bezier(.68,-0.55,.27,1.55)
-
-    &.success
-        @include notification($success)
-    &.warning
-        @include notification($warning)
-    &.critical
-        @include notification($critical)
-    &.info
-        @include notification($info)
-
-    &.show
-        opacity: 1
-        transform: scale(1)
-
-    &.hide
-        margin: 0
-        max-height: 0
-
-        opacity: 0
-        transform: translateX(100%)
-
-        transition: all 0.4s ease-in-out, max-height 0.2s ease-in-out
-
-.sniffle__notification-icon
-    margin: 0
-    padding: 1rem
-
-    width: auto
-    height: auto
-
-    display: flex
-    justify-content: center
-    align-items: center
-
-    background-color: RGB($bg-200)
-
-    svg
-        width: 1.25rem
-        height: 1.25rem
-
-.sniffle__notification-text
-    margin: 0
-    padding: 1rem
-
-    width: auto
-    height: auto
-
-    display: flex
-    flex-direction: column
-    justify-self: center
-    align-self: center
-
-    font-size: 1rem
-    font-weight: 600
-    line-height: 1
-    text-align: left
-
-.sniffle__notification-time
-    margin: 0
-    padding: 0
-
-    width: 450px
-    height: 3px
-
-    position: absolute
-    bottom: 0px
-    left: 0px
-
-    background-color: RGB($fg-white)
-
-    animation: notificationTimeout 5.1s linear
-
-@media (max-width: $breakpoint)
-    .notifications
-        width: calc(100vw - 0.6rem)
-        height: auto
-
-    .sniffle__notification
-        width: 100%
-
-        &.hide
-            opacity: 0
-            transform: translateY(-5rem)
-    
-    .sniffle__notification-time
-        width: 100%