[BRANDING] Update nodeinfo branding

- Change the values for the nodeinfo API, to use branded values.
- Resolves https://codeberg.org/forgejo/forgejo/issues/257

(cherry picked from commit 4608c57688)
(cherry picked from commit e837e8a529)
(cherry picked from commit 6601328d3c)
(cherry picked from commit c6be21d487)
(cherry picked from commit 5adc6ffee2)
(cherry picked from commit 2ff8d166ac)
(cherry picked from commit b6a90e7e5a)
(cherry picked from commit d1089e706c)

Conflicts:
	tests/integration/api_nodeinfo_test.go
(cherry picked from commit 7a29df737d)
(cherry picked from commit 3655a30c60)
(cherry picked from commit c90d611410)
(cherry picked from commit 0274bd8860)
(cherry picked from commit fdb786b71d)
(cherry picked from commit 4f08f100a1)

tests/integration/api_nodeinfo_test.go

@@ -32,7 +32,7 @@ func TestNodeinfo(t *testing.T) {
 		var nodeinfo api.NodeInfo
 		DecodeJSON(t, resp, &nodeinfo)
 		assert.True(t, nodeinfo.OpenRegistrations)
-		assert.Equal(t, "gitea", nodeinfo.Software.Name)
+		assert.Equal(t, "forgejo", nodeinfo.Software.Name)
 		assert.Equal(t, 25, nodeinfo.Usage.Users.Total)
 		assert.Equal(t, 18, nodeinfo.Usage.LocalPosts)
 		assert.Equal(t, 2, nodeinfo.Usage.LocalComments)