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

tldr/cotton

@@ -0,0 +1,21 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# cotton
+
+> Markdown test specification runner.
+> More information: <https://github.com/chonla/cotton>.
+
+- Use a specific base URL:
+
+`cotton -u {{base_url}} {{path/to/file.md}}`
+
+- Disable certificate verification (insecure mode):
+
+`cotton -u {{base_url}} -i {{path/to/file.md}}`
+
+- Stop running when a test fails:
+
+`cotton -u {{base_url}} -s {{path/to/file.md}}`