feat(aspen/emacs): Begin a complete emacs config revamp

I'm still on doom, but without all the cruft I've accumulated over the
last ~6 years it's actually good and fast and nice. Also, the config is
literate now!

The old emacs is still in .emacs.d, since occasionally I want to
reference it, but eventually I'll just get rid of it

Change-Id: Icda840d798594f7e6b188dba044494597d5f6043
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10999
Reviewed-by: aspen <root@gws.fyi>
Tested-by: BuildkiteCI

users/aspen/emacs/snippets/haskell-mode/benchmark-module

@@ -0,0 +1,26 @@
+# key: bench
+# name: benchmark-module
+# expand-env: ((yas-indent-line (quote fixed)))
+# --
+--------------------------------------------------------------------------------
+module ${1:`(if (not buffer-file-name) "Module"
+                (let ((name (file-name-sans-extension (buffer-file-name)))
+                      (case-fold-search nil))
+                     (if (cl-search "bench/" name)
+                         (replace-regexp-in-string "/" "."
+                           (replace-regexp-in-string "^\/[^A-Z]*" ""
+                             (car (last (split-string name "src")))))
+                         (file-name-nondirectory name))))`} ( benchmark, main ) where
+--------------------------------------------------------------------------------
+import Bench.Prelude
+--------------------------------------------------------------------------------
+import ${1:$(s-chop-suffix "Bench" yas-text)}
+--------------------------------------------------------------------------------
+
+main :: IO ()
+main = defaultMain [benchmark]
+
+--------------------------------------------------------------------------------
+
+benchmark :: Benchmark
+benchmark = bgroup "${1:$(->> yas-text (s-chop-suffix "Bench") (s-split ".") -last-item)}" [bench "something dumb" $ nf (1 +) (1 :: Int)]