Codeblock refactor w/ hide/show [Fixes #1776]

[wackerow]

Description

Refactors codeblocks, automatically collapsing code blocks over 8 lines, with button to show all/show less, and refactored Copy button to address color dissonance and to match new changes.

• Moved buttons to float over upper right corner of codeblock
• show all/show less button toggles between collapsed with overflow scrolling, and showing all lines of code
• padding-top adjusted IF buttons present, to avoid overlapping for smaller devices or long strings on line 1 of code, leaving simple codeblocks without copy functionality grossly unchanged
• Both buttons given unobtrusive hover-over effects
• Changes coloring to always work on the current codeblock coloring theme
• Decreased font-size by 25% for button text
• Added logic to remove last line if blank (per a TODO comment)
  (On that note, went through the markdown files and removed any blank lines that were placed before closing ``` tag, which were adding an additional empty line at the end of codeblocks when rendered)
• Logic hides show/hide button if codeblock 8 lines or less.
• Logic for showing/hiding copy button remains unchanged (only shows for supported languages)

Related Issue #1776

(*autoformatting added a \ before $USD on oracles page... two commits trying to fix it just keeps autoformatting it back in)

[ryancreatescopy]

Thanks Paul, my only comment is on the button size. I understand why you've made the text smaller but I think this could be at the detriment of accessibility – it's pretty hard to read. I think it'd be ok with the button copy at 16px as per the others.

[wackerow]

That is with default 1rem size... and yeah, I agree, this size looks clean still and easier to read.

@ryancreatescopy That padding look okay to you? Let me know if you have any other design suggestions, happy to tweak as needed.

[ryancreatescopy]

Looks good to merge!