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

tldr/mcfly

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# mcfly
+
+> A smart command history search and management tool.
+> Replaces your default shell history search (ctrl-r) with an intelligent search engine providing context and relevance to the commands.
+> More information: <https://github.com/cantino/mcfly>.
+
+- Print the mcfly integration code for the specified shell:
+
+`mcfly init {{bash|fish|zsh}}`
+
+- Search the history for a command, with 20 results:
+
+`mcfly search --results {{20}} "{{search_terms}}"`
+
+- Add a new command to the history:
+
+`mcfly add "{{command}}"`
+
+- Record that a directory has moved and transfer the historical records from the old path to the new one:
+
+`mcfly move "{{path/to/old_directory}}" "{{path/to/new_directory}}"`
+
+- Train the suggestion engine (developer tool):
+
+`mcfly train`
+
+- Display help for a specific subcommand:
+
+`mcfly help {{subcommand}}`