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

tldr/cvs

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# cvs
+
+> Concurrent Versions System, a revision control system.
+> More information: <https://cvs.nongnu.org>.
+
+- Create a new repository (requires the `CVSROOT` environment variable to be set externally):
+
+`cvs -d {{path/to/repository}} init`
+
+- Add a project to the repository:
+
+`cvs import -m "{{message}}" {{project_name}} {{version}} {{vendor}}`
+
+- Checkout a project:
+
+`cvs checkout {{project_name}}`
+
+- Show changes made to files:
+
+`cvs diff {{path/to/file}}`
+
+- Add a file:
+
+`cvs add {{path/to/file}}`
+
+- Commit a file:
+
+`cvs commit -m "{{message}}" {{path/to/file}}`
+
+- Update the working directory from the remote repository:
+
+`cvs update`