Port front-end to React

[justinlewis]

We want to port from basic Node templates and JQuery to better facilitate:

1. Readability to better support contributors
2. Test-ability
3. Modularity
4. Re-usability

The MVP passing criteria for this ticket should be a replication of existing functionality with minimal deviation from the current behavior. Improvements on UI/UX can be considered but might necessitate a separate ticket if design work is significant enough to warrant lengthy consideration by the team contributors. That new ticket would be considered a new enhancement.

Master Feature Port List:

• Basic main map page layout
• Welcome modal
• Data issues modal
• Profile modal
• Log in modal
• About modal
• Initial map render (with defalut initial data load)
• Map feature hover events
• Map feature click events
• Area/crag click response panel
• Area/crag hover charts - IN-PROGRESS by @justinlewis
• Map layer toggle
• Time slider & associated time slider ticks over time chart - IN-PROGRESS by @justinlewis
• Route type filter selector
• Crag/area search bar
  ...