RFR: Section on sponsoring [v2]

[Jesper Wilhelmsson]

On Sun, 5 Feb 2023 12:59:39 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

>> Copied and updated the text from the old sponsoring page: https://openjdk.org/sponsor/
>> The purpose is to have the sponsor link on the OpenJDK page lead here instead.
>> 
>> Also updated the contributing section with some parts taken from the old contributing page: https://openjdk.org/contribute/
>> Again, the intention is to change the link on the OpenJDK page to lead here.
>
> Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Updated text to cover more usecases.

Thank you for reviewing @dholmes-ora!

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PR: https://git.openjdk.org/guide/pull/97