remove explicit /srv/ usage from docker-compose files

We have plenty of paths used in the application, but two of them
are hardcoded in examples all over the code for historical reasons.

I found that by default in Docker, the path would resolve to the value
we are setting it explicitly to, so it doesn't make sense to set
a few variables we are setting now explicitly.

backend/_example/memory_store/compose-dev-memstore.yml

@@ -29,7 +29,6 @@ services:
     environment:
       - REMARK_URL=http://127.0.0.1:8080
       - SECRET=123456
-      - BACKUP_PATH=/srv/var/backup
       - DEBUG=true
       - EMOJI=true
       - AUTH_ANON=true

compose-dev-backend.yml

@@ -35,8 +35,6 @@ services:
       #            - TIME_ZONE=GMT
       - REMARK_URL=http://127.0.0.1:8080
       - SECRET=12345
-      - STORE_BOLT_PATH=/srv/var/db
-      - BACKUP_PATH=/srv/var/backup
       - DEBUG=true
       - ADMIN_PASSWD=password
       - AUTH_DEV=true # activate local oauth "dev"

compose-dev-frontend.yml

@@ -32,8 +32,6 @@ services:
     environment:
       - REMARK_URL=http://127.0.0.1:8080
       - SECRET=12345
-      - STORE_BOLT_PATH=/srv/var/db
-      - BACKUP_PATH=/srv/var/backupang
       - DEBUG=true
       - ADMIN_PASSWD=password
       - AUTH_DEV=true # activate local oauth "dev"

docker-compose.yml

@@ -21,8 +21,6 @@ services:
     environment:
       - REMARK_URL
       - SECRET
-      - STORE_BOLT_PATH=/srv/var/db
-      - BACKUP_PATH=/srv/var/backup
       - DEBUG=true
       - AUTH_GOOGLE_CID
       - AUTH_GOOGLE_CSEC

site/src/docs/manuals/kubernetes/index.md

@@ -47,10 +47,6 @@ spec:
                 secretKeyRef:
                   name: remark42
                   key: SECRET
-            - name: STORE_BOLT_PATH
-              value: "/srv/var/db"
-            - name: BACKUP_PATH
-              value: "/srv/var/backup"
             - name: AUTH_GOOGLE_CID
               valueFrom:
                 secretKeyRef:

site/src/docs/manuals/reproxy/index.md

@@ -53,8 +53,6 @@ services:
       - SECRET=some-secret-thing
       - USER=app
       - REMARK_URL=https://remark42.example.com
-      - STORE_BOLT_PATH=/srv/var
-      - BACKUP_PATH=/srv/var/backup
       - CACHE_MAX_VALUE=10000000
       - IMAGE_PROXY_HTTP2HTTPS=true
       - AVATAR_RESIZE=48