fix(website): fix flaky e2e test blocking production deploys (#38)

* fix(deploy): rewrite base href per example so assets resolve to correct subpath

Production Angular examples at examples.stream-resource.dev returned 404 for
main.js, styles.css, and chunks. Root cause: all index.html files had
<base href="/"> so asset URLs resolved to the domain root instead of
/{product}/{topic}/. Fix: assemble script now rewrites base href to the
correct subpath for each example.

* fix(website): use .first() on form locator to handle multiple forms on pricing page

Author: blove

apps/website/e2e/website.spec.ts

@@ -28,7 +28,7 @@ test('pricing page shows 4 plan cards', async ({ page }) => {
 test('pricing page lead form validates required fields', async ({ page }) => {
   await page.goto('/pricing');
   await page.click('button[type="submit"]');
-  await expect(page.locator('form')).toBeVisible();
+  await expect(page.locator('form').first()).toBeVisible();
 });
 
 test('docs page renders sidebar and content', async ({ page }) => {