Update Contributors docs (Lombiq Technologies: OCORE-138)

[Piedone]

Fixes #14586.

• Clarified how to use the All Contributors bot.
• Added @viktoriamagyar as a test, who was the main organizer of Orchard Harvest 2023.
• Simplified the root Readme a bit, to clarify where to start if you want to use OC and if you want to contribute and otherwise what to look for. Previously, you were first pointed to clone the repo, which is not what you want if you just want to consume OC. Also removed the link to the outdated Roadmap, see Disable Wiki #15061.
• Moving Contributors.md to the docs site.
• Adding a cool map that shows where our contributors come from.

[Piedone]

@all-contributors please add @viktoriamagyar for eventOrganizing

[allcontributors]

@Piedone

@viktoriamagyar already contributed before to eventOrganizing

[Piedone]

Note that this will only work in main. I generated the initial map in a different repo.

[hishamco]

Did she contribute? I prefer to use the bot after merging this PR

[Piedone]

Yes, she was the main organizer of Orchard Harvest 2023. The bot can be used, what I did under #15036, but it has policy bot issues under its own PRs so I included that change here.

[hishamco]

Yes, she was the main organizer of Orchard Harvest 2023

Sure I never forgot that, but we commonly added contributors if they contribute to the code or docs

[Piedone]

Perhaps we commonly do that, but the point of All Contributors is specifically to "Recognize All Contributors
Including those that don't push code". That's why they also have the eventOrganizing category that I used.

[Piedone]

I'm making the root Readme a bit easier to digest still, stay tuned.

[agriffard]

Wiki disabled in the Settings.

[agriffard]

Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/docs/en/emoji-key))!
on https://docs.orchardcore.net/en/latest/docs/community/contributors/

Is the Emoji key expected like that?

[Piedone]

If you mean why is that link there (it renders for me), then it wad previously also there, but I guess to help people understand who contributed what.