Remove wrong-spelled submodules

Author: flexferrum

.gitmodules

@@ -1,12 +1,6 @@
 [submodule "thirdparty/gtest"]
         path = thirdparty/gtest
         url = https://github.com/google/googletest.git
-[submodule "thirdparty/nonstd/variant-light"]
-        path = thirdparty/nonstd/variant-light
-        url = https://github.com/martinmoene/variant-lite.git
-[submodule "thirdparty/nonstd/expected-light"]
-        path = thirdparty/nonstd/expected-light
-        url = https://github.com/martinmoene/expected-lite.git
 [submodule "thirdparty/nonstd/value-ptr-lite"]
         path = thirdparty/nonstd/value-ptr-lite
         url = https://github.com/flexferrum/value-ptr-lite.git