Update cheatsheets

tldr/i3

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# i3
+
+> A tiling window manager for X11.
+> More information: <https://i3wm.org/docs/userguide.html>.
+
+- Start `i3` (Note that a pre-existing window manager must not be open when this command is run):
+
+`i3`
+
+- Open a new terminal window:
+
+`<Super Enter>`
+
+- Move the focused window to a workspace:
+
+`<Super Shift {{Number}}>`
+
+- Switch to a workspace:
+
+`<Super {{Number}}>`
+
+- Split the next window horizontally:
+
+`<Super h>`
+
+- Split the next window vertically:
+
+`<Super v>`
+
+- Open an application launcher:
+
+`<Super d>`