Added Gitea OAuth login and account management.

[gytisrepecka]

Added Gitea OAuth login and account management functionality based on Matt's guidelines.

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• I have signed the CLA

[cjeller1592]

Got it working on my instance @gytisrepecka! Just had an issue during set up that I lay out in a comment. Otherwise works great from a user perspective!

[gytisrepecka]

If possible, pull sources once again and try building:

go get -d -u -v code.gyt.is/writefreely
cd ~/go/src/code.gyt.is/writefreely
git checkout oauth-gitea

[cjeller1592]

If possible, pull sources once again and try building:

go get -d -u -v code.gyt.is/writefreely
cd ~/go/src/code.gyt.is/writefreely
git checkout oauth-gitea

Just did this & got Gitea OAuth login working on my instance with the added host in the config. Thanks for the additions @gytisrepecka!

[gytisrepecka]

Merged current develop branch and resolved pages/login.tmpl conflict.

This version is running live on fedi.dev.

[thebaer]

Everything looks good! Just need to run go fmt on these Go files and we can get this merged.

[thebaer]

Thanks for your patience on my review -- just some quick formatting needed and we can get this in.

[gytisrepecka]

Performed formatting:

$ gofmt -w account.go
$ gofmt -w config/config.go
$ gofmt -w oauth.go
$ gofmt -w oauth_gitea.go
$ gofmt -w routes.go

Please take a look if there's something else.

[thebaer]

Looks good! Thanks for your great work on this.