fix: cleanup all external CC-BY-SA works for license compliance

reference/bitmap assets/REUSE.toml

@@ -1,8 +1,8 @@
 version = 1
 
 [[annotations]]
-path = "Nycticorax_nycticorax12.jpg"
+path = "Jokulsarlon_lake,_Iceland.jpg"
 precedence = "override"
-SPDX-FileComment = "Source: https://commons.wikimedia.org/wiki/File:Nycticorax_nycticorax12.jpg"
-SPDX-FileCopyrightText = "Calibas"
-SPDX-License-Identifier = "CC-BY-SA-3.0"
+SPDX-FileComment = "Source: https://commons.wikimedia.org/wiki/File:Jokulsarlon_lake,_Iceland.jpg"
+SPDX-FileCopyrightText = "2006 Kenneth Muir"
+SPDX-License-Identifier = "CC-BY-2.0"