WEB-81 Add commit message hook to enforce "WEB-XX" prefix

[wlenig]

• Add husky, a standard and lightweight dependency that auto sets up git hooks
  • Without husky, each dev would need to manually copy hooks into their local .git/hooks/ directory — which isn't tracked by git and can't be shared through the repo
  • With husky, hooks are setup as part of npm install
• Moved appropriate config files, directories to root
  • Husky expects git root and project root to be the same directory -- this is actually standard project layout for node projects
    • Upon review, I realized the project layout was not according to standard
• Added commit message hook to ensure commits begin with "WEB-[0-9]+"