Minimal surgery to get github organisations crawling working again

[yarikoptic]

• just use pygithub directly
• use Token credential for "api.github.com" or stored in cfg hub.oauthtoken

[codecov[bot]]

Codecov Report

Patch coverage: 32.14% and project coverage change: -0.04 :warning:

Comparison is base (f86b5e2) 77.60% compared to head (66e9b2f) 77.56%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #136 +/- ## ========================================== - Coverage 77.60% 77.56% -0.04% ========================================== Files 60 60 Lines 4701 4720 +19 Branches 953 956 +3 ========================================== + Hits 3648 3661 +13 - Misses 889 895 +6 Partials 164 164 ``` | [Impacted Files](https://app.codecov.io/gh/datalad/datalad-crawler/pull/136?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=datalad) | Coverage Δ | | |---|---|---| | [datalad\_crawler/pipelines/gh.py](https://app.codecov.io/gh/datalad/datalad-crawler/pull/136?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=datalad#diff-ZGF0YWxhZF9jcmF3bGVyL3BpcGVsaW5lcy9naC5weQ==) | `13.26% <15.78%> (+13.26%)` | :arrow_up: | | [datalad\_crawler/pipelines/tests/test\_gh.py](https://app.codecov.io/gh/datalad/datalad-crawler/pull/136?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=datalad#diff-ZGF0YWxhZF9jcmF3bGVyL3BpcGVsaW5lcy90ZXN0cy90ZXN0X2doLnB5) | `56.00% <62.50%> (-4.87%)` | :arrow_down: | | [datalad\_crawler/version.py](https://app.codecov.io/gh/datalad/datalad-crawler/pull/136?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=datalad#diff-ZGF0YWxhZF9jcmF3bGVyL3ZlcnNpb24ucHk=) | `100.00% <100.00%> (ø)` | |

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[yarikoptic]

I have pushed codespell fixed typo directly to master in 0de99c3f100520ddd6a877ac2afaea482bdd0634 since unrelated. The fix worked while updating openneuro datasets, so let's proceed