Addressing some issues w/ Katas

[risdenk]

• generally use backticks for code and specific identifiers
• use backticks instead of italics for easier identification
• Remove incorrect details from TECHNICAL_DETAILS.md
• fix lists and newlines that weren't rendered as new lines in markdown
• move images to new folder to make it clear all the katas that exist

[epugh]

THanks for all this leg work.