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

tldr/axel

@@ -0,0 +1,30 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# axel
+
+> Download accelerator.
+> Supports HTTP, HTTPS, and FTP.
+> More information: <https://github.com/axel-download-accelerator/axel>.
+
+- Download a URL to a file:
+
+`axel {{url}}`
+
+- Download and specify an [o]utput file:
+
+`axel {{url}} -o {{path/to/file}}`
+
+- Download with a specific [n]umber connections:
+
+`axel -n {{connections_num}} {{url}}`
+
+- [S]earch for mirrors:
+
+`axel -S {{mirrors_num}} {{url}}`
+
+- Limit download [s]peed (bytes per second):
+
+`axel -s {{speed}} {{url}}`