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/lens.field

@@ -0,0 +1,7 @@
+# -*- mode: snippet -*-
+# name: lens.field
+# key: lens
+# expand-env: ((yas-indent-line 'fixed))
+# --
+${1:field} :: Lens' ${2:Source} ${3:Target}
+$1 = lens _${4:sourceField} $ \\${2:$(-> yas-text s-word-initials s-downcase)} ${4:$(-> yas-text s-word-initials s-downcase)} -> ${2:$(-> yas-text s-word-initials s-downcase)} { _$4 = ${4:$(-> yas-text s-word-initials s-downcase)} }