helix: add page (#6653)

pages/common/helix.md

@@ -0,0 +1,33 @@
+# vim
+
+> 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/>.
+
+- Open a file:
+
+`helix {{path/to/file}}`
+
+- Change the Helix theme:
+
+`:theme {{theme_name}}`
+
+- Save and Quit:
+
+`:wq<Enter>`
+
+- Force-quit without saving:
+
+`:q!<Enter>`
+
+- Undo the last operation:
+
+`u`
+
+- Search for a pattern in the file (press `n`/`N` to go to next/previous match):
+
+`/{{search_pattern}}<Enter>`
+
+- Format the file:
+
+`:format`