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

tldr/hg-clone

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# hg clone
+
+> Create a copy of an existing repository in a new directory.
+> More information: <https://www.mercurial-scm.org/doc/hg.1.html#clone>.
+
+- Clone a repository to a specified directory:
+
+`hg clone {{remote_repository_source}} {{destination_path}}`
+
+- Clone a repository to the head of a specific branch, ignoring later commits:
+
+`hg clone --branch {{branch}} {{remote_repository_source}}`
+
+- Clone a repository with only the `.hg` directory, without checking out files:
+
+`hg clone --noupdate {{remote_repository_source}}`
+
+- Clone a repository to a specific revision, tag or branch, keeping the entire history:
+
+`hg clone --updaterev {{revision}} {{remote_repository_source}}`
+
+- Clone a repository up to a specific revision without any newer history:
+
+`hg clone --rev {{revision}} {{remote_repository_source}}`