Create custom category_info file which works with topics from ORNL repositories

The automatically generated file explore/github-data/intRepo_Metadata.json maps each repository to several properties, one of these being topics . Some of these topics will be mentioned in the manually generated file category/category_info.json .

So:

• A repository can have many topics
• A category can have many topics
• Repositories and topics are defined from Github, categories are defined by us.

What we need

We need to create a custom category_info list that works with the pre-existing topics already in the ORNL repository, so that we can display real data instead of fake data. A 1-1 mapping of categories to topics is probably okay to start with for now, though we will eventually change this.

Each category needs to have a title, an icon (with a functional image path and alternative text), a short and long description (can be empty), and an array of topics.

For now, it's okay to reuse the existing images across multiple categories.