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

tldr/grumphp

@@ -0,0 +1,21 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# grumphp
+
+> A PHP Composer plugin that enables source code quality checks.
+> More information: <https://github.com/phpro/grumphp>.
+
+- Register the Git hooks:
+
+`grumphp git:init`
+
+- Trigger the pre-commit hook manually:
+
+`grumphp git:pre-commit`
+
+- Check every versioned file:
+
+`grumphp run`