Ignores a file generated by conan setup

Also, sorts those gitignores.

.gitignore

@@ -1,12 +1,13 @@
-CMakeLists.txt.user
 CMakeCache.txt
 CMakeFiles
+CMakeLists.txt.user
 CMakeScripts
-Testing
-Makefile
-cmake_install.cmake
-install_manifest.txt
-compile_commands.json
+CMakeUserPresets.json
 CTestTestfile.cmake
+Makefile
+Testing
 _deps
 build
+cmake_install.cmake
+compile_commands.json
+install_manifest.txt

CMakeUserPresets.json

@@ -1,9 +0,0 @@
-{
-    "version": 4,
-    "vendor": {
-        "conan": {}
-    },
-    "include": [
-        "/home/ronh/work/cpp-challenge/build/CMakePresets.json"
-    ]
-}