add jargon busting

[chennesy]

• Adds an optional episode, jargon_busting.md, to the learners/ directory
• This optional Jargon Busting episode comes from the LC Overview lesson, but was edited here for clarity and to highlight Glosario.
• Adds a callout in the Intro episode to point to the Jargon Busting episode
• Includes instructor notes that Jargon Busting is an optional exercise for learners in this lesson

This is step two (of two) to resolve an issue that aims to move the Jargon Busting episode from LC Overview to other LC lessons that could serve as introductions to full LC core workshops. The episode will also be added to the new Tidy Data lesson - see PR 149. This decision was made in collaboration with @LibraryCarpentry/curriculum-advisors.