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

tldr/git-lock

@@ -0,0 +1,14 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# git lock
+
+> Lock a file in a Git repository from being modified by a commit.
+> Part of `git-extras`. See also `git-unlock`.
+> More information: <https://github.com/tj/git-extras/blob/master/Commands.md#git-lock>.
+
+- Disable the ability to commit changes of a local file:
+
+`git lock {{path/to/file}}`