Add Axe accessibility E2E tests (#2)

Reviewed-on: #2

playwright.config.ts

@@ -11,7 +11,7 @@ if (!chromiumExecutable) {
 }
 
 export default defineConfig({
-  testDir: './tests/e2e',
+  testDir: './e2e',
   fullyParallel: false,
   workers: 1,
   use: {
@@ -22,7 +22,7 @@ export default defineConfig({
   },
   webServer: [
     {
-      command: `TWITTER_LITE_MOCK_RELAY_PORT=${relayPort} node tests/e2e/mock-relay.mjs`,
+      command: `TWITTER_LITE_MOCK_RELAY_PORT=${relayPort} node e2e/mock-relay.mjs`,
       port: relayPort,
       reuseExistingServer: false,
       timeout: 120_000,