Added description about Google Oauth2 setup

[webpav]

DESCRIBE YOUR PR

I tried to add google auth to my sentry self-hosted and got an error. I have googled a lot of time and finally find solution.
I would like to add it to docs
Thanks

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[getsantry]

This pull request has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you add the label WIP, I will leave it alone unless WIP is removed ... forever!

---

"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[webpav]

Please review 🙏

[webpav]

@azaslavsky please review

[webpav]

@azaslavsky please review

[webpav]

@vaind
@bruno-garcia
@chargome
@lfrost
Please review commit 🙏

[chargome]

Hi @pasha121, thanks for opening up a PR! As for the content, the steps you outlined are already present in the google developer documentation in the link above your changes, so I would rather not add them here.

[webpav]

Hi @pasha121, thanks for opening up a PR! As for the content, the steps you outlined are already present in the google developer documentation in the link above your changes, so I would rather not add them here.

But there is no info about redirect URIs for sentry self-hosted.
I have added info about redirect URIs to avoid of 400 google oauth error.

[webpav]

@chargome