Codify Vercel install + ignore commands

Author: MattIPv4

apps/site/vercel.json

@@ -0,0 +1,5 @@
+{
+  "$schema": "https://openapi.vercel.sh/vercel.json",
+  "installCommand": "pnpm install --prod",
+  "ignoreCommand": "[[ \"$VERCEL_GIT_COMMIT_REF\" =~ \"^dependabot/.*\" || \"$VERCEL_GIT_COMMIT_REF\" =~ \"^gh-readonly-queue/.*\" ]]"
+}

docs/technologies.md

@@ -292,8 +292,8 @@ Benefits:
 
 #### Vercel Integration
 
-- Automatic deployments for branches (excluding `dependabot/*` and `gh/*`)
-- Custom install script: `pnpm install --prod --frozen-lockfile`
+- Automatic deployments for branches
+- Custom install script: [see `vercel.json`](/apps/site/vercel.json)
 - Dependency management: Build-time dependencies must be in `dependencies`, not `devDependencies`
 - Sponsorship maintained by OpenJS Foundation