Update .github directory: add copyright information

- Exclude renovate.json
- Rename reuse.toml: capitalization

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

.github/FUNDING.yml

@@ -1,3 +1,8 @@
+# SPDX-FileCopyrightText: 2020 - 2021 Slavi Pantaleev
+# SPDX-FileCopyrightText: 2022 Marko Weltzer
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
 ---
 # These are supported funding model platforms