wal-telegram: add page (#8431)

* wal-telegram: added page

Co-authored-by: CleanMachine1 <78213164+CleanMachine1@users.noreply.github.com>

pages/linux/wal-telegram.md

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+# wal-telegram
+
+> Generates themes for Telegram based the colors generated by pywal/wal.
+> More information: <https://github.com/guillaumeboehm/wal-telegram>.
+
+- Generate with wal's palette and the current wallpaper (feh only):
+
+`wal-telegram`
+
+- Generate with wal's palette and a specified background image:
+
+`wal-telegram --background={{path/to/image}}`
+
+- Generate with wal's palette and a colored background based on the palette:
+
+`wal-telegram --tiled`
+
+- Apply a gaussian blur on the background image:
+
+`wal-telegram -g`
+
+- Specify a location for the generated theme (default is `$XDG_CACHE_HOME/wal-telegram` or `~/.cache/wal-telegram`):
+
+`wal-telegram --destination={{path/to/destination}}`
+
+- Restart the telegram app after generation:
+
+`wal-telegram --restart`