fix: use https instead of ssh for submodule

.gitignore

@@ -9,6 +9,7 @@ __pycache__/
 *.so
 
 # Distribution / packaging
+src/zolfa/nd2reader/version.py
 .Python
 env/
 env27/

.gitmodules

@@ -1,4 +1,4 @@
 [submodule "docs"]
 	path = docs
-	url = git@github.com:rbnvrw/nd2reader.git
+	url = https://github.com/rbnvrw/nd2reader.git
 	branch = gh-pages

src/zolfa/nd2reader/version.py

@@ -1,4 +0,0 @@
-# file generated by setuptools_scm
-# don't change, don't track in version control
-__version__ = version = '2.0.2.dev268+g026928a.d20230117'
-__version_tuple__ = version_tuple = (2, 0, 2, 'dev268', 'g026928a.d20230117')