Move pages under tldr, lint run.sh, update docs

tldr/linux/notify-send

@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# notify-send
+
+> Uses the current desktop environment's notification system to create a notification.
+> More information: <https://manned.org/notify-send>.
+
+- Show a notification with the title "Test" and the content "This is a test":
+
+`notify-send "{{Test}}" "{{This is a test}}"`
+
+- Show a notification with a custom icon:
+
+`notify-send -i {{icon.png}} "{{Test}}" "{{This is a test}}"`
+
+- Show a notification for 5 seconds:
+
+`notify-send -t 5000 "{{Test}}" "{{This is a test}}"`
+
+- Show a notification with an app's icon and name:
+
+`notify-send "{{Test}}" --icon={{google-chrome}} --app-name="{{Google Chrome}}"`