MSP/Sound adjustments

# Changes
* Added volume sliders to webclient
* Added/swapped music files

Author: Volte6

Makefile

@@ -6,7 +6,6 @@ BIN ?= go-mud-server
 DOCKER_COMPOSE := docker-compose -f provisioning/docker-compose.yml
 
 export GOFLAGS := -mod=mod
-export GOSUMDB := off
 
 ## Build Targets