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

tldr/git-clean

@@ -0,0 +1,33 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# git clean
+
+> Remove untracked files from the working tree.
+> More information: <https://git-scm.com/docs/git-clean>.
+
+- Delete files that are not tracked by Git:
+
+`git clean`
+
+- Interactively delete files that are not tracked by Git:
+
+`git clean -i`
+
+- Show what files would be deleted without actually deleting them:
+
+`git clean --dry-run`
+
+- Forcefully delete files that are not tracked by Git:
+
+`git clean -f`
+
+- Forcefully delete directories that are not tracked by Git:
+
+`git clean -fd`
+
+- Delete untracked files, including ignored files in `.gitignore` and `.git/info/exclude`:
+
+`git clean -x`