Refactor experiments to leverage AI_Service layer

[jeffpaul]

What problem does this address?

With #101 merged and part of the 0.2.1 release, we'll want to refactor the various experiments to leverage that layer.

What is your proposed solution?

• refactor Abilities Explorer to use AI_Service layer
• refactor Alt Text Generation to use AI_Service layer
• refactor Content Summarization to use AI_Service layer
• refactor Excerpt Generation to use AI_Service layer
• refactor Image Generation to use AI_Service layer
• refactor Title Generation to use AI_Service layer