docs: add docs for vim mode

docs/vimMode/actions.txt

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+Vim actions are essentially just when a user uses a Vim keybind.
+Things like yanking and pasting are Vim actions.
+This is not an "offical Vim thing," just a Hilbish thing.
+
+The `hilbish.vimAction` hook is thrown whenever a Vim action occurs.
+It passes 2 arguments: the action name, and an array (table) of args
+relating to it.
+
+Here is documentation for what the table of args will hold for an
+appropriate Vim action.
+
+- `yank`: register, yankedText
+The first argument for the yank action is the register yankedText goes to.
+
+- `paste`: register, pastedText
+The first argument for the paste action is the register pastedText is taken from.

docs/vimMode/index.txt

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+Hilbish has a Vim binding input mode accessible for use.
+It can be enabled with the `hilbish.inputMode` function (check `doc hilbish`).
+
+This is documentation for everything relating to it.