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

tldr/linux/xclip

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# xclip
+
+> X11 clipboard manipulation tool, similar to `xsel`.
+> Handles the X primary and secondary selections, plus the system clipboard (`Ctrl + C`/`Ctrl + V`).
+> See also: `wl-copy`.
+> More information: <https://manned.org/xclip>.
+
+- Copy the output from a command to the X11 primary selection area (clipboard):
+
+`echo 123 | xclip`
+
+- Copy the output from a command to a given X11 selection area:
+
+`echo 123 | xclip -selection {{primary|secondary|clipboard}}`
+
+- Copy the output from a command to the system clipboard, using short notation:
+
+`echo 123 | xclip -sel clip`
+
+- Copy the contents of a file into the system clipboard:
+
+`xclip -sel clip {{input_file.txt}}`
+
+- Copy the contents of a PNG into the system clipboard (can be pasted in other programs correctly):
+
+`xclip -sel clip -t image/png {{input_file.png}}`
+
+- Copy the user input in the console into the system clipboard:
+
+`xclip -i`
+
+- Paste the contents of the X11 primary selection area to the console:
+
+`xclip -o`
+
+- Paste the contents of the system clipboard to the console:
+
+`xclip -o -sel clip`