Fixes authentication confusion

Sets the default authentication to ssh. The user is informed of this choice and provides information on how to use other forms of authentication.

hooks/pre_gen_project.py

@@ -5,6 +5,6 @@
     "package_name": cookiecutter.package_name.lower().replace(" ", "_").replace("-", "_"),
     "directory_name": cookiecutter.directory_name.lower().replace(" ", "-"),
     "full_name": cookiecutter.full_name.replace('\"', '\\\"'),
-    "repository": "https://github.com/" + cookiecutter.github_organization + "/" + cookiecutter.directory_name.lower().replace(" ", "-"),
+    "repository": "git@github.com:" + cookiecutter.github_organization + "/" + cookiecutter.directory_name.lower().replace(" ", "-"),
     "package_short_description": cookiecutter.package_short_description.replace('\"', '\\\"')
 }) }}

{{cookiecutter.directory_name}}/next_steps.md

@@ -6,6 +6,13 @@ Once your Python package is created, put it under [version
 control](https://guide.esciencecenter.nl/#/best_practices/version_control) using
 [git](https://git-scm.com/) and [GitHub](https://github.com/).
 
+Note that the next step assumes you have setup your connection to GitHub via SSH,
+see [Connecting to GitHub with SSH](https://docs.github.com/en/github-ae@latest/authentication/connecting-to-github-with-ssh).
+
+Alternatively, you can also use a personal access token, see
+[Creating a personal access token](https://docs.github.com/en/github-ae@latest/authentication/keeping-your-account-and-data-secure/creating-a-personal-access-token).  If you choose this option, below you will have to replace
+`git@github.com:` by `https://github.com/`.
+
 ```shell
 cd {{ cookiecutter.directory_name }}
 git init