feat: add info related to the current instance

this commit adds additional info about instance like release tag and instance maintainer contact.

fix: https://codeberg.org/zyachel/libremdb/issues/8

.env.local.example

@@ -28,3 +28,11 @@ NEXT_TELEMETRY_DISABLED=1
 # USE_REDIS=true
 ## for docker, just set the domain to the container name, default is 'libremdb_redis'
 REDIS_URL=localhost:6379
+
+################################################################################
+### 4. INSTANCE META FIELDS(not required but good to have)
+################################################################################
+## example: 'https://iket.me'. 
+NEXT_PUBLIC_INSTANCE_MAIN_URL=
+## eg: 'zyachel'
+NEXT_PUBLIC_INSTANCE_NAME=