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

tldr/git-flow

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# git flow
+
+> A collection of Git extensions to provide high-level repository operations.
+> More information: <https://github.com/nvie/gitflow>.
+
+- Initialize it inside an existing Git repository:
+
+`git flow init`
+
+- Start developing on a feature branch based on `develop`:
+
+`git flow feature start {{feature}}`
+
+- Finish development on a feature branch, merging it into the `develop` branch and deleting it:
+
+`git flow feature finish {{feature}}`
+
+- Publish a feature to the remote server:
+
+`git flow feature publish {{feature}}`
+
+- Get a feature published by another user:
+
+`git flow feature pull origin {{feature}}`