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

tldr/linkchecker

@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# linkchecker
+
+> Command-line client to check HTML documents and websites for broken links.
+> More information: <https://linkchecker.github.io/linkchecker/>.
+
+- Find broken links on <https://example.com/>:
+
+`linkchecker {{https://example.com/}}`
+
+- Also check URLs that point to external domains:
+
+`linkchecker --check-extern {{https://example.com/}}`
+
+- Ignore URLs that match a specific regular expression:
+
+`linkchecker --ignore-url {{regular_expression}} {{https://example.com/}}`
+
+- Output results to a CSV file:
+
+`linkchecker --file-output {{csv}}/{{path/to/file}} {{https://example.com/}}`