refactor: rest api endpoints

[mikosramek]

Endpoints were getting way too long and hard to read, especially when doing requests around steps.

IE, http://localhost:3000/api/v1/63bcd5b40fa7101840a82609/63bcd47e3c6419acae2d13df/steps/63bcd47e3c6419acae2d13ac/63bcd47e3c6419acae2d13ae because of how account, army, and step id were being passed as query params.

This is now http://localhost:3000/api/v1/rules/create

Account ids have been moved to mainly be a request header. Army and step ids have been moved to mainly be apart of the request body.

/api/v1/:accountId/armies	/api/v1/armies
GET /	GET /:accountId
POST /create	POST /create
GET /:armyId	[removed]

/api/v1/:accountId/:armyId/steps	/api/v1/steps
GET /	GET /:armyId
POST /create	POST /create
POST /:stepId/new-rule	[moved]
DELETE /:stepId/:ruleId	[moved]

[n/a]	/api/v1/rules
[n/a]	POST /create
[n/a]	DELETE /remove