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

tldr/tidy

@@ -0,0 +1,22 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# tidy
+
+> Clean up and pretty print HTML, XHTML and XML files.
+> Note: `tidy` cannot preserve original indentation.
+> More information: <https://api.html-tidy.org/tidy/tidylib_api_5.2.0/tidy_cmd.html>.
+
+- Pretty print an HTML file:
+
+`tidy {{path/to/file.html}}`
+
+- Enable [i]ndentation, [w]rapping lines in 100, saving to `output.html`:
+
+`tidy --indent y --wrap 100 -output {{path/to/output.html}} {{path/to/file.html}}`
+
+- Modify an HTML file in-place using a configuration file:
+
+`tidy -config {{path/to/configuration}} -modify {{path/to/file.html}}`