Split help into multiple files and add help command

runtime/help/keybindings.md

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+### Keybindings
+
+Here are the default keybindings in json form which is also how
+you can rebind them to your liking.
+
+```json
+{
+	"Up":             "CursorUp",
+	"Down":           "CursorDown",
+	"Right":          "CursorRight",
+	"Left":           "CursorLeft",
+	"ShiftUp":        "SelectUp",
+	"ShiftDown":      "SelectDown",
+	"ShiftLeft":      "SelectLeft",
+	"ShiftRight":     "SelectRight",
+	"AltLeft":        "WordLeft",
+	"AltRight":       "WordRight",
+	"AltShiftRight":  "SelectWordRight",
+	"AltShiftLeft":   "SelectWordLeft",
+	"CtrlLeft":       "StartOfLine",
+	"CtrlRight":      "EndOfLine",
+	"CtrlShiftLeft":  "SelectToStartOfLine",
+	"CtrlShiftRight": "SelectToEndOfLine",
+	"CtrlUp":         "CursorStart",
+	"CtrlDown":       "CursorEnd",
+	"CtrlShiftUp":    "SelectToStart",
+	"CtrlShiftDown":  "SelectToEnd",
+	"Enter":          "InsertEnter",
+	"Space":          "InsertSpace",
+	"Backspace":      "Backspace",
+	"Backspace2":     "Backspace",
+	"Alt-Backspace":  "DeleteWordLeft",
+	"Alt-Backspace2": "DeleteWordLeft",
+	"Tab":            "InsertTab",
+	"CtrlO":          "OpenFile",
+	"CtrlS":          "Save",
+	"CtrlF":          "Find",
+	"CtrlN":          "FindNext",
+	"CtrlP":          "FindPrevious",
+	"CtrlZ":          "Undo",
+	"CtrlY":          "Redo",
+	"CtrlC":          "Copy",
+	"CtrlX":          "Cut",
+	"CtrlK":          "CutLine",
+	"CtrlD":          "DuplicateLine",
+	"CtrlV":          "Paste",
+	"CtrlA":          "SelectAll",
+	"CtrlT":          "AddTab"
+	"CtrlRightSq":    "PreviousTab",
+	"CtrlBackslash":  "NextTab",
+	"Home":           "Start",
+	"End":            "End",
+	"PageUp":         "CursorPageUp",
+	"PageDown":       "CursorPageDown",
+	"CtrlG":          "ToggleHelp",
+	"CtrlR":          "ToggleRuler",
+	"CtrlL":          "JumpLine",
+	"Delete":         "Delete",
+	"Esc":            "ClearStatus",
+	"CtrlB":          "ShellMode",
+	"CtrlQ":          "Quit",
+	"CtrlE":          "CommandMode",
+	"CtrlW":          "NextSplit",
+	
+	// Emacs-style keybindings
+	"Alt-f": "WordRight",
+	"Alt-b": "WordLeft",
+	"Alt-a": "StartOfLine",
+	"Alt-e": "EndOfLine",
+	"Alt-p": "CursorUp",
+	"Alt-n": "CursorDown"
+}
+```
+
+You can use the alt keys + arrows to move word by word.
+Ctrl left and right move the cursor to the start and end of the line, and
+ctrl up and down move the cursor the start and end of the buffer.
+
+You can hold shift with all of these movement actions to select while moving.
+
+The bindings may be rebound using the `~/.config/micro/bindings.json`
+file. Each key is bound to an action.
+
+For example, to bind `Ctrl-y` to undo and `Ctrl-z` to redo, you could put the
+following in the `bindings.json` file.
+
+```json
+{
+	"CtrlY": "Undo",
+	"CtrlZ": "Redo"
+}
+```