Clean up .gitmodules file, keeping only the wiki submodule

Author: JohanDevl

.gitmodules

@@ -1,15 +1,3 @@
 [submodule "wiki"]
 	path = wiki
 	url = https://github.com/JohanDevl/Export_Trakt_4_Letterboxd.wiki.git
-[submodule "tests/bats"]
-	path = tests/bats
-	url = https://github.com/bats-core/bats-core.git
-[submodule "tests/helpers/bats-support"]
-	path = tests/helpers/bats-support
-	url = https://github.com/bats-core/bats-support.git
-[submodule "tests/helpers/bats-assert"]
-	path = tests/helpers/bats-assert
-	url = https://github.com/bats-core/bats-assert.git
-[submodule "tests/helpers/bats-file"]
-	path = tests/helpers/bats-file
-	url = https://github.com/bats-core/bats-file.git