Creation Error: Path Cannot Start With Slash

Similar to #293.

## Error

When I run `statuspage create --token=`, I get the following error:

```
/usr/lib/python3/dist-packages/requests/__init__.py:89: RequestsDependencyWarning: urllib3 (1.26.12) or chardet (3.0.4) doesn't match a supported version!
warnings.warn("urllib3 ({}) or chardet ({}) doesn't match a supported "
Name: statuspage-test
Systems, eg (Website,API): SPORC-Cluster,KGCOE-GitLab,Mirrors,Documentation,OnDemand,Ticketing,Website,Grafana,Virtualization
Deleting initial labels: 100%|██████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 9/9 [00:01<00:00, 5.05it/s]
Creating status labels: 100%|███████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 3/3 [00:00<00:00, 4.87it/s]
Creating system labels: 100%|███████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 9/9 [00:02<00:00, 4.23it/s]
Traceback (most recent call last):
File "/usr/local/bin/statuspage", line 8, in
sys.exit(cli())
File "/usr/local/lib/python3.8/dist-packages/click/core.py", line 829, in __call__
return self.main(*args, **kwargs)
File "/usr/local/lib/python3.8/dist-packages/click/core.py", line 782, in main
rv = self.invoke(ctx)
File "/usr/local/lib/python3.8/dist-packages/click/core.py", line 1259, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/usr/local/lib/python3.8/dist-packages/click/core.py", line 1066, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/usr/local/lib/python3.8/dist-packages/click/core.py", line 610, in invoke
return callback(*args, **kwargs)
File "/usr/local/lib/python3.8/dist-packages/statuspage/statuspage.py", line 65, in create
run_create(name=name, token=token, systems=systems, org=org, private=private)
File "/usr/local/lib/python3.8/dist-packages/statuspage/statuspage.py", line 257, in run_create
repo.create_file(
File "/usr/local/lib/python3.8/dist-packages/github/Repository.py", line 2090, in create_file
headers, data = self._requester.requestJsonAndCheck(
File "/usr/local/lib/python3.8/dist-packages/github/Requester.py", line 353, in requestJsonAndCheck
return self.__check(
File "/usr/local/lib/python3.8/dist-packages/github/Requester.py", line 378, in __check
raise self.__createException(status, responseHeaders, output)
github.GithubException.GithubException: 422 {"message": "path cannot start with a slash", "errors": [{"resource": "Commit", "field": "path", "code": "invalid"}], "documentation_url": "https://docs.github.com/rest/reference/repos#create-or
-update-file-contents"}
```

I verified that the repo `statuspage-test` does not exist. The repo gets created, but is empty.

## API Key

Checked Only:
- public_repo
- write:repo_hook

## Versions

- OS: Ubuntu 20.04 LTS
- Python: 3.8.10
- statuspage: 0.8.1
- PyGithub: 1.55

Reproduce `statuspage create --token=` with the reported versions, then inspect `statuspage/statuspage.py` at `create` line 65 and `run_create` line 257, especially the `repo.create_file` call. Confirm which path is sent to GitHub and verify that creation completes without the 422 error and leaves the repository populated.

Written by the indexing model from the issue text.