fix(wpcarro/nix): Remove <briefcase> references

Angle-bracketed references are a Nix anti-pattern, and thankfully this
repository enforces this as a standard.

TL;DR:
- Drop angle-bracketed references
- Change `briefcase` -> `users.wpcarro`
- Fix any resulting regressions
- Fix //users/wpcarro/tools/simple_vim
- Mark //users/wpcarro/boilerplate/typescript and related projects
  as broken
- drop .skip-subtree file, enabling depot CI

Change-Id: I7153cbabafa617bfd6b199370cbec65cb75441f6
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4325
Tested-by: BuildkiteCI
Reviewed-by: wpcarro <wpcarro@gmail.com>
Reviewed-by: tazjin <mail@tazj.in>
Reviewed-by: grfn <grfn@gws.fyi>
Autosubmit: wpcarro <wpcarro@gmail.com>

users/wpcarro/website/habit-screens/default.nix

@@ -1,4 +1,4 @@
-{ pkgs ? <nixpkgs> , ... }:
+{ pkgs, ... }:
 
 with pkgs;
 
@@ -16,9 +16,9 @@ let
       inherit name src;
 
       buildInputs = [ elmPackages.elm ]
-        ++ lib.optional outputJavaScript nodePackages_10_x.uglify-js;
+        ++ lib.optional outputJavaScript nodePackages.uglify-js;
 
-      buildPhase = pkgs.elmPackages.fetchElmDeps {
+      buildPhase = elmPackages.fetchElmDeps {
         elmPackages = import srcs;
         elmVersion = "0.19.1";
         inherit registryDat;
@@ -35,7 +35,7 @@ let
           ${lib.optionalString outputJavaScript ''
             echo "minifying ${elmfile module}"
             uglifyjs $out/${module}.${extension} --compress 'pure_funcs="F2,F3,F4,F5,F6,F7,F8,F9,A2,A3,A4,A5,A6,A7,A8,A9",pure_getters,keep_fargs=false,unsafe_comps,unsafe' \
-                | uglifyjs --mangle --output=$out/${module}.min.${extension}
+                | uglifyjs --mangle --output $out/${module}.min.${extension}
           ''}
         '') targets)}
       '';
@@ -58,4 +58,3 @@ in stdenv.mkDerivation {
   '';
   dontInstall = true;
 }
-