Preserve `author`with link and `introduction` in `MetaInfo`? about plugincatalogue

[Fallen-Breath]

There are 2 kinds of information for a plugin:

• The one as a valid MCDR plugin, stored in meta.json or mcdreforged.plugin.json
• The one as a published plugin in this catalogue, stored in plugin_info.json

Although there are some shared data in these 2 kinds of information, it's not correct to just mix them together: the former one is required in each releases, but for the latter one only the latest is needed

There are 2 fields in your request: author and introduction

• For the author fields, the request is reasonable, but it's not good to just put everything inside the author array. I'll add a separated file to store all authors information
• For the introduction field, it's part of the information of a published plugin, which means I'll also store that into another file, like the meta branch version of the plugin_info.json. I was mixing these 2 information kinds in the solution of #256, and now it's going to be fixed