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

tldr/kak

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# kak
+
+> Kakoune is a mode-based code editor implementing the "multiple selections" paradigm.
+> Data can be selected and simultaneously edited in different locations, using multiple selections; users can also connect to the same session for collaborative editing.
+> More information: <https://kakoune.org>.
+
+- Open a file and enter normal mode, to execute commands:
+
+`kak {{path/to/file}}`
+
+- Enter insert mode from normal mode, to write text into the file:
+
+`i`
+
+- Escape insert mode, to go back to normal mode:
+
+`<Esc>`
+
+- Replace all instances of "foo" in the current file with "bar":
+
+`%s{{foo}}<Enter>c{{bar}}<Esc>`
+
+- Unselect all secondary selections, and keep only the main one:
+
+`<Space>`
+
+- Search for numbers and select the first two:
+
+`/\d+<Enter>N`
+
+- Insert the contents of a file:
+
+`!cat {{path/to/file}}<Enter>`
+
+- Save the current file:
+
+`:w<Enter>`