Port homepage intro to fastapi

Port the main home page content to fastapi.

test/test_homepage.py

@@ -0,0 +1,36 @@
+from http import HTTPStatus
+from unittest.mock import patch
+
+from fastapi.testclient import TestClient
+
+from aurweb.asgi import app
+
+client = TestClient(app)
+
+
+def test_homepage():
+    with client as request:
+        response = request.get("/")
+    assert response.status_code == int(HTTPStatus.OK)
+
+
+@patch('aurweb.util.get_ssh_fingerprints')
+def test_homepage_ssh_fingerprints(get_ssh_fingerprints_mock):
+    fingerprints = {'Ed25519': "SHA256:RFzBCUItH9LZS0cKB5UE6ceAYhBD5C8GeOBip8Z11+4"}
+    get_ssh_fingerprints_mock.return_value = fingerprints
+
+    with client as request:
+        response = request.get("/")
+
+    assert list(fingerprints.values())[0] in response.content.decode()
+    assert 'The following SSH fingerprints are used for the AUR' in response.content.decode()
+
+
+@patch('aurweb.util.get_ssh_fingerprints')
+def test_homepage_no_ssh_fingerprints(get_ssh_fingerprints_mock):
+    get_ssh_fingerprints_mock.return_value = {}
+
+    with client as request:
+        response = request.get("/")
+
+    assert 'The following SSH fingerprints are used for the AUR' not in response.content.decode()