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

tldr/rbash

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# rbash
+
+> Restricted Bash shell, equivalent to `bash --restricted`.
+> Does not permit changing the working directory, redirecting command output, or modifying environment variables, among other things.
+> See also `histexpand` for history expansion.
+> More information: <https://www.gnu.org/software/bash/manual/html_node/The-Restricted-Shell>.
+
+- Start an interactive shell session:
+
+`rbash`
+
+- Execute a command and then exit:
+
+`rbash -c "{{command}}"`
+
+- Execute a script:
+
+`rbash {{path/to/script.sh}}`
+
+- Execute a script, printing each command before executing it:
+
+`rbash -x {{path/to/script.sh}}`
+
+- Execute commands from a script, stopping at the first error:
+
+`rbash -e {{path/to/script.sh}}`
+
+- Read and execute commands from `stdin`:
+
+`rbash -s`