[Feature][@rspress/plugin-rss]: Support RSS html feedline for Rspack/Rstack toolings blog #1405
Description
What problem does this feature solve?
At present, the document of Rspack or Rsbuild website is in md format, which makes us unable to browse normally in the Rss reader
https://rspack.dev/rss/blog-rss.xml
https://rspack.dev/rss/blog-rss-zh.xml
our expected behavior is output the html format
related to #851
What does the proposed API look like?
support html and can be viewed in rss reader like https://github.com/RSSNext/Follow