chore: add nixpkg for sed cmd

.tangled/workflows/deploy.yml

···
   nixpkgs:
     - nodejs
     - coreutils
+    - toybox
     - curl
     - pnpm
 
 environment:
   SITE_PATH: 'build'
-  SITE_NAME: 'jollywhoppers'
+  SITE_NAME: 'Jollywhoppers'
   WISP_HANDLE: 'jollywhoppers.com'
 
 steps:
   - name: build site
     command: |
-      # necessary to ensure bun is in PATH
+      # necessary to ensure pnpm is in PATH
       export PATH="$HOME/.nix-profile/bin:$PATH"
 
       pnpm install