Remove content submodule

Closes: #1260

.github/workflows/ci.yml

@@ -3,10 +3,10 @@ name: Celestia
 on:
   push:
     branches: [ master ]
-    paths: [ src/**, .github/workflows/*.yml ]
+    paths: [ src/**, .github/workflows/*.yml, CMakeLists.txt ]
   pull_request:
     branches: [ master ]
-    paths: [ src/**, .github/workflows/*.yml ]
+    paths: [ src/**, .github/workflows/*.yml, CMakeLists.txt ]
 
 env:
   BUILD_TYPE: RelWithDebInfo

.gitignore

@@ -22,3 +22,4 @@ extras-standard/
 models/
 textures/
 mingw/
+content/

CMakeLists.txt

@@ -55,7 +55,6 @@ option(ENABLE_TOOLS   "Build different tools? (Default: off)" OFF)
 option(NATIVE_OSX_APP "Support native OSX paths read data from (Default: off)" OFF)
 option(FAST_MATH      "Build with unsafe fast-math compiller option (Default: off)" OFF)
 option(ENABLE_TESTS   "Enable unit tests? (Default: off)" OFF)
-option(ENABLE_DATA    "Install data from content submodule? (Default: on)" ON)
 option(ENABLE_GLES    "Build for OpenGL ES 2.0 instead of OpenGL 2.1 (Default: off)" OFF)
 option(USE_GTKGLEXT   "Use libgtkglext1 for GTK2 frontend (Default: on)" ON)
 option(USE_GTK3       "Use Gtk3 in GTK2 frontend (Default: off)" OFF)
@@ -402,10 +401,6 @@ add_subdirectory(locale)
 add_subdirectory(scripts)
 add_subdirectory(shaders)
 
-if(ENABLE_DATA)
-  add_subdirectory(content)
-endif()
-
 if(ENABLE_TESTS)
   enable_testing()
   add_subdirectory(test)

content

@@ -1 +0,0 @@
-Subproject commit 6d3ffb4813b6839553f9fee652fc0844b8282dc2