feat: community Q&A software investigation required

[gqcn]

We expect the official website to handle the majority of traffic for the open-source community. Therefore, we aim to address user pain points centrally on the official website. The Q&A community has several responsibilities:
1. Add a Q&A community section to the official website, where users can exchange and resolve all their questions in one place.
2. Automatically synchronize content from GitHub issues to a specific section of the community for easier data search and traffic concentration.
3. Ensure the Q&A community pages are optimized for SEO.

We need to investigate open-source, lightweight Q&A community software (or BBS open-source versions) that can be integrated into the official website. The Q&A data should be stored for future use, such as training AI models.

[mingzaily]

推荐 flarum，轻量，插件多

[gqcn]

https://answer.apache.org/