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

tldr/mitmdump

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# mitmdump
+
+> View, record, and programmatically transform HTTP traffic.
+> The command-line counterpart to mitmproxy.
+> More information: <https://docs.mitmproxy.org/stable/#mitmdump>.
+
+- Start a proxy and save all output to a file:
+
+`mitmdump -w {{path/to/file}}`
+
+- Filter a saved traffic file to just POST requests:
+
+`mitmdump -nr {{input_filename}} -w {{output_filename}} "{{~m post}}"`
+
+- Replay a saved traffic file:
+
+`mitmdump -nc {{path/to/file}}`