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

tldr/loadtest

@@ -0,0 +1,21 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# loadtest
+
+> Run a load test on the selected HTTP or WebSockets URL.
+> More information: <https://github.com/alexfernandez/loadtest>.
+
+- Run with concurrent users and a specified amount of requests per second:
+
+`loadtest --concurrency {{10}} --rps {{200}} {{https://example.com}}`
+
+- Run with a custom HTTP header:
+
+`loadtest --headers "{{accept:text/plain;text-html}}" {{https://example.com}}`
+
+- Run with a specific HTTP method:
+
+`loadtest --method {{GET}} {{https://example.com}}`