rtv: add page (#1233)

pages/common/rtv.md

@@ -0,0 +1,28 @@
+# rtv
+
+> Reddit Terminal Viewer.
+> Use arrow keys to navigate. Right and Left to view and return from a submission, respectively.
+
+- Open the front page:
+
+`/front`
+
+- Open a subreddit:
+
+`/r/{{subreddit_name}}`
+
+- Expand/collapse comments:
+
+`[space]`
+
+- Open link:
+
+`o`
+
+- Login:
+
+`u`
+
+- Open the help screen:
+
+`?`