Adds outcomes and discussion sizes

Adds outcomes to discoto and discussion size indicators.

High-level points:

1. Can now declare outcome: AABBCC in addition to point: AABBCC
   • If an outcome is declared, all points and sub-topics are collapsed underneath the outcome
2. Nothing is collapsed at the top level until outcomes are added
   • The gif shows a top-level outcome with collapsed points/sub-topics
   • The screenshot does not have a top-level outcome, which means nothing is collapsed
3. Adds relative discussion-size indicators with braille
   • More dots == relatively larger discussion
   • Max number of braille dots == 24, if discussion sizes are larger, one dot will map to multiple discussion units
   • discussion_size == points.size + sub_topics.size + sub_topics.map(&:discussion_size).sum / 2.0
     • Discussion units within sub-topics count at half the rate as discussion units at higher levels

Fixes #11

Screenshots

The gif below shows nested outcomes, with everything being collapsed under the top-level outcome. See this issue for the source of the gif.

The screenshot below is a good example of the relative discussion size indicators (the braille dots). More dots == more discussions have occurred, including in sub topics. See this issue for the source of the screenshot

Checklist

• Manually verified passing unit tests for this branch locally by running bin/run_docker_tests.sh
  • Yes, this is a pain, but GitLab doesn't run reasonably within a docker container in a normal CI pipeline
  • See bin/run_docker_tests.sh --help for faster/iterative testing options
• Paste local test output

Local Test Output

/bin/run_docker_tests.sh output

OUTPUT HERE

Closes #11