Remove artplayer-plugin-liquid-glass plugin

- Deleted the plugin files including JavaScript, CSS, README, and type definitions.
- Removed references to the plugin from the documentation.
- Cleaned up the package structure by removing the .npmignore and package.json files related to the plugin.

docs/assets/ts/artplayer-plugin-libass.d.ts

@@ -1,15 +0,0 @@
-declare const artplayerPluginAss: (options: Options) => (art: Artplayer) => {
-  name: 'artplayerPluginLibass'
-  libass: SubtitlesOctopus
-  visible: boolean
-  init: () => void
-  switch: (url: string) => void
-  show: () => void
-  hide: () => void
-  destroy: () => void
-}
-
-export default artplayerPluginAss
-
-export = artplayerPluginLibass
-export as namespace artplayerPluginLibass;

docs/assets/ts/artplayer-plugin-liquid-glass.d.ts

@@ -1,16 +0,0 @@
-interface Option {
-  'width': string
-  'max-width': string
-  'min-width': string
-}
-
-interface Result {
-  name: 'artplayerPluginLiquidGlass'
-}
-
-declare const artplayerPluginLiquidGlass: (option?: Option) => (art: Artplayer) => Result
-
-export default artplayerPluginLiquidGlass
-
-export = artplayerPluginLiquidGlass
-export as namespace artplayerPluginLiquidGlass;