[v8.5.x] Fix website build errors (#66110)

* remove links to broken release notes pages

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

* Fix relref to Dashboard folders and Dashboard version history

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

* Fix reference to Fine-grained access control

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

* Add packages_api build in published docs

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

* Fix alerting test

---------

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>
Co-authored-by: Armand Grillet <2117580+armandgrillet@users.noreply.github.com>

pkg/tests/api/alerting/api_alertmanager_test.go

@@ -204,7 +204,8 @@ func TestAMConfigAccess(t *testing.T) {
 	})
 
 	t.Run("when creating silence", func(t *testing.T) {
-		body := `
+		now := time.Now()
+		body := fmt.Sprintf(`
 		{
 			"comment": "string",
 			"createdBy": "string",
@@ -216,9 +217,10 @@ func TestAMConfigAccess(t *testing.T) {
 				"value": "string"
 			  }
 			],
-			"startsAt": "2021-03-31T13:17:04.419Z"
+			"startsAt": "%s",
+			"endsAt": "%s"
 		  }
-		`
+		`, now.Format(time.RFC3339), now.Add(10*time.Second).Format(time.RFC3339))
 
 		testCases := []testCase{
 			{