Replace Cypress with Playwright

Playwright is more flexible and has better developer experience than Cypress.
We add end to end tests covering:

  - project source browsing
    - tree view
    - commit list view
    - commit view
  - routing
    - hash based
    - history API based
  - clipboard copy paste functionality
  - seed view
  - project search
  - landing page view
  - settings

Co-authored-by: Sebastian Martinez <me@sebastinez.dev>
Signed-off-by: Rūdolfs Ošiņš <rudolfs@osins.org>

playwright.config.ts

@@ -0,0 +1,50 @@
+import type { PlaywrightTestConfig } from "@playwright/test";
+import { devices } from "@playwright/test";
+
+const config: PlaywrightTestConfig = {
+  testDir: "./tests/e2e",
+  timeout: 30_000,
+  expect: {
+    timeout: 8000,
+  },
+  fullyParallel: true,
+  outputDir: "./tests/artifacts",
+  workers: process.env.CI ? 1 : undefined,
+  forbidOnly: !!process.env.CI,
+  retries: process.env.CI ? 2 : 0,
+  reporter: "list",
+  globalSetup: "./tests/support/globalSetup",
+  use: {
+    actionTimeout: 0,
+    baseURL: "http://localhost:3000",
+    trace: "retain-on-failure",
+  },
+
+  projects: [
+    {
+      name: "chromium",
+      use: {
+        ...devices["Desktop Chrome"],
+      },
+    },
+    {
+      name: "firefox",
+      use: {
+        ...devices["Desktop Firefox"],
+      },
+    },
+    {
+      name: "webkit",
+      use: {
+        ...devices["Desktop Safari"],
+      },
+    },
+  ],
+
+  webServer: {
+    command: "npm run start",
+    port: 3000,
+  },
+};
+
+export default config;