Rename HedgeDoc and Element to match new names

docker-compose.yml

@@ -2,8 +2,8 @@ version: "3"
 
 services:
 
-  riot:
+  element:
-    build: riot
+    build: element
     restart: always
     ports:
       - 8080:80
@@ -55,8 +55,8 @@ services:
     environment:
       - "DISCORD_WEBHOOK=${PROMETHEUS_DISCORD_WEBHOOK}"
 
-  codimd:
+  hedgedoc:
-    build: codimd
+    build: hedgedoc
     restart: always
     environment:
       - "CMD_DB_URL=${CODIMD_DB_URL}"