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

tldr/git-sizer

@@ -0,0 +1,21 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# git sizer
+
+> Computes various Git repository size metrics and alerts you to any that might cause problems or inconvenience.
+> More information: <https://github.com/github/git-sizer>.
+
+- Report only statistics that have a level of concern greater than 0:
+
+`git sizer`
+
+- Report all statistics:
+
+`git sizer -v`
+
+- See additional options:
+
+`git sizer -h`