helix: fix command name, hx: add page (#8242)

* helix: fix command name

* Update helix.md

* Create hx.md

pages/common/helix.md

@@ -1,8 +1,8 @@
-# vim
+# helix
 
 > Helix, A post-modern text editor, provides several modes for different kinds of text manipulation.
 > Pressing `i` enters insert mode. `<Esc>` enters normal mode, which enables the use of Helix commands.
-> More information: <https://helix-editor.com/>.
+> More information: <https://helix-editor.com>.
 
 - Open a file:
 

pages/common/hx.md

@@ -0,0 +1,7 @@
+# hx
+
+> This command is an alias of `helix`.
+
+- View documentation for the original command:
+
+`tldr helix`