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

tldr/r

@@ -0,0 +1,37 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# R
+
+> R language interpreter.
+> More information: <https://www.r-project.org>.
+
+- Start a REPL (interactive shell):
+
+`R`
+
+- Start R in vanilla mode (i.e. a blank session that doesn't save the workspace at the end):
+
+`R --vanilla`
+
+- Execute a file:
+
+`R -f {{path/to/file.R}}`
+
+- Execute an R expression and then exit:
+
+`R -e {{expr}}`
+
+- Run R with a debugger:
+
+`R -d {{debugger}}`
+
+- Check R packages from package sources:
+
+`R CMD check {{path/to/package_source}}`
+
+- Display version:
+
+`R --version`