Refactor code

[souvikinator]

b35e168 (#74)

• Fix column and column_list handler

more to add...

[souvikinator]

23c44db (#74)

• Lower abstraction methods (like blockToMarkdown) must not call higher abstraction methods (like toMarkdownString)

  Why?:

  • blockToMarkdown converts a single block to a markdown string
  • toMarkdownString processes & combines all the MdBlock[] content.

  Both work at different abstraction levels and should only do the work they are responsible for. (Idk if this is right but sounds good to me 😅)

• Move toggle handler from blockToMarkdown to toMarkdownString to maintain the output format of blocksToMarkdown