Move Emacs documents to //emacs

These documents outline some of my Elisp conventions and ideas. As such,
I think //emacs should host them.

emacs/elisp-conventions.md

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+# Elisp Conventions
+
+Some of this aligns with existing style guides. Some of it does not.
+
+In general, prefer functions with fixed arities instead of variadic
+alternatives.
+
+- Namespace functions with `namespace/function-name`
+- Use `ensure`, `assert`, `refute` whenever possible.
+- When talking about encoding and decoding, let's use the words "encoding" and
+  "decoding" rather than the myriad of other variants that appear like:
+  - `marshalling` and `unmarshalling`
+  - `parse` and `deparse`, `serialize`, `stringify`
+  - `unpickle` and `pickle` (Python)
+  - `from-string` and `to-string`
+  - TODO: Add more examples of these; there should be close to a dozen.
+- Annotate assertions with `!` endings.
+- Prefer the Scheme style of `predicate?`
+- Variadic functions *should* encode this by appending * onto their
+  name. E.g. `maybe/nil?*`

emacs/keybindings.md

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+# Keybindings
+
+Since I'm using Emacs to manage most of my workflow, all of the keybindings
+should be defined herein and -- in order to scale -- order must be imposed. This
+can help avoid KBD collisions and improve my ability to remember each KBD.
+
+See `kbd.el` for the programmatic encoding of these principles.
+
+## Troubleshooting
+
+When in doubt, use Emacs's `read-key` and `read-event` to learn what signal
+you're sending Emacs.
+
+### Super-
+
+- EXWM X11 windows are not processing `s-`.
+- EXWM X11 windows are not processing `<M-ESC>`.
+
+### Super-Ctrl-
+
+I'm reserving `C-s-` for opening X11 applications.
+
+- `terminator`: `t`
+- `google-chrome`: `c`
+
+## Emacs nouns
+
+Most of my keybindings should be organized according to their function, which in
+turn should be related to the following Emacs nouns.
+
+- `workspace`: As defined by EXWM.
+- `frame`: What non-Emacs users would call a "window". Currently my workflow
+  doesn't use or rely on Emacs frames.
+- `window`: A vertical or horizontal split within an Emacs frame.
+- `buffer`: Anything storing text in memory.
+
+## Prefixes and their meanings
+
+TODO: Have a system for leader-prefixed KBDs, chords, and prefixed chords.
+
+- `s-`: Switching between named workspaces. Right now, super is too overloaded
+  and would benefit from having more deliberate keybindings.
+- `C-M-`: Window sizing
+- `M-{h,j,k,l}`: Window traversing
+- `M-{\,-}`: Window splitting
+- `M-q`: Window deletion
+- `<leader>-q`: Window deletion

emacs/snippets.md

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+# Snippets
+
+Specifying snippets that I plan on defining for most of the programming
+languages with which I work. I hope this will serve as a checklist of language
+constructs I should support when adopting a new language.
+
+## Shared language features
+
+These are language features that should be available across most of the
+languages that I'm hoping to support.
+
+- `ld`: anonymous functions (i.e. lambdas)
+- `fn`: named function definition
+- `var`: variable definition
+
+## Miscellaneous other language KBDs
+
+Some of this is related to language tool must-haves, which may need to be a
+separate document.
+
+- `<leader>d`: Show documentation
+- `<leader>x`: Evaluate expression (works mostly for LISPs)