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

tldr/linux/xmodmap

@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# xmodmap
+
+> Utility for modifying keymaps and pointer button mappings in X.
+> More information: <https://manned.org/xmodmap>.
+
+- Swap left-click and right-click on the pointer:
+
+`xmodmap -e 'pointer = 3 2 1'`
+
+- Reassign a key on the keyboard to another key:
+
+`xmodmap -e 'keycode {{keycode}} = {{keyname}}'`
+
+- Disable a key on the keyboard:
+
+`xmodmap -e 'keycode {{keycode}} ='`
+
+- Execute all xmodmap expressions in the specified file:
+
+`xmodmap {{path/to/file}}`