API endpoints for Combat and Gameplay Mechanics

[zachanator070]

From what I can tell there is currently not an API endpoint to get information from the following sections that the front end has:

Combat:

• Actions in Combat
• Attacking
• Combat Sequence
• Cover
• Damage & Healing
• Mounted combat
• Movement in Combat
• Underwater Combat

Gameplay Mechanics:

• Ability Scores
• Between Adventures
• Environment
• Movement
• Objects
• Rest
• Saving Throws
• Time

I imagine this may be as easy as adding each of these sections to data/WOTC_5e_SRD_v5.1/sections.json

This doesn't sound too hard as it looks like just converting the html you have in the UI to markdown and then adding to the json file. I think I can make a PR but I wanted to ask before I put work into it.