Meta: Remove nlohmann/json dependency

.gitmodules

@@ -4,9 +4,6 @@
 [submodule "inferno/vendor/glm"]
 	path = vendor/glm
 	url = https://github.com/g-truc/glm
-[submodule "inferno/vendor/json"]
-	path = vendor/json
-	url = https://github.com/nlohmann/json
 [submodule "inferno/vendor/entt"]
 	path = vendor/entt
 	url = https://github.com/skypjack/entt

README.org

@@ -39,7 +39,6 @@ Or
 - [[https://github.com/Dav1dde/glad][glad]]
 - [[https://github.com/glfw/glfw][GLFW]]
 - [[https://github.com/g-truc/glm][GLM]]
-- [[https://github.com/nlohmann/json][JSON]]
 - [[https://github.com/lua/lua][Lua]]
 - [[https://github.com/riyyi/ruc][ruc]]
 - [[https://github.com/ThePhD/sol2][sol3]]

vendor/json

@@ -1 +0,0 @@
-Subproject commit bde57124187c5732c026ffb9357c0491344c45e7