chore(web/snixbolt): move to contrib

Change-Id: Ic69648c526e6c1a0b769b26642b3c799872eb87c

contrib/snixbolt/default.nix

@@ -0,0 +1,32 @@
+{ pkgs, lib, depot, ... }:
+let
+  pkgsCross = pkgs.pkgsCross.wasm32-unknown-none;
+in
+(pkgsCross.callPackage ./Cargo.nix {
+  defaultCrateOverrides = (depot.snix.utils.defaultCrateOverridesForPkgs pkgsCross) // {
+    snixbolt = prev: {
+      src = depot.snix.utils.filterRustCrateSrc { root = prev.src.origSrc; };
+    };
+  };
+}).rootCrate.build.overrideAttrs (oldAttrs: {
+  installPhase = ''
+    ${lib.getExe pkgs.wasm-bindgen-cli} \
+      --target web \
+      --out-dir $out \
+      --out-name ${oldAttrs.crateName} \
+      --no-typescript \
+      target/lib/${oldAttrs.crateName}-${oldAttrs.metadata}.wasm
+
+      mv src/*.{html,css} $out
+  '';
+
+  passthru.serve = pkgs.writeShellScriptBin "snixbolt-serve" ''
+    ${lib.getExe pkgs.simple-http-server} \
+        --index \
+        --nocache \
+        "$@" \
+        ${depot.contrib.snixbolt}
+  '';
+
+  meta.ci.extraSteps.crate2nix-check = depot.snix.utils.mkCrate2nixCheck ./Cargo.nix;
+})