update doc

docs/judger/api.md

@@ -34,6 +34,7 @@ mkdir build && cd build && cmake .. && make && sudo make install
 
  - `cpu_time`:  cpu time the process has used
  - `real_time`:  actual running time of the process
+ - `real_time`:  max vaule of memory used by the processd
  - `signal`:  signal number
  - `exit_code`:  process's exit code
  - `result`:  judger result, details in `runner.h`

docs/judgeserver/deploy.md

@@ -7,59 +7,24 @@ Reuqirements:
 
 Docker images:
 
-  - docker pull qduoj/judge_server (from Docker Hub)
-  - docker pull registry.cn-hangzhou.aliyuncs.com/v-image/judge_server && docker tag registry.cn-hangzhou.aliyuncs.com/v-image/judge_server qduoj/judge_server (from Aliyun mirror)
+  - docker pull registry.cn-hangzhou.aliyuncs.com/onlinejudge/judge_server
 
 Three environment variables below must be set manually in `docker-compose.yml`
  
-  - `service_discovery_url`
-  - `service_url`
+  - `SERVICE_URL`
+  - `BACKEND_URL`
+  - `TOKEN`
 
-You should manually create `token.txt` to store `judger_token`.
-
-`judge_server` will send heartbeat request to `service_discovery_url` every five seconds.
+`judge_server` will send heartbeat request to `backend_url` every five seconds.
   
 `service_url` is used to tell server to send task to this url(`judge_server`).
 
-Example of `docker-compose.yml`
-
-```yaml
-version: "2"
-services:
-    judge_server:
-        image: qduoj/judge_server
-        cpu_quota: 90000
-        read_only: true
-        cap_drop:
-            - SETPCAP
-            - MKNOD
-            - NET_BIND_SERVICE
-            - SYS_CHROOT
-            - SETFCAP
-            - FSETID
-        tmpfs:
-            - /tmp
-            - /judger_run:exec,mode=777
-            - /spj:exec,mode=777
-        volumes:
-            - $PWD/tests/test_case:/test_case:ro
-            - /data/log:/log
-            - $PWD/server:/code:ro
-            - $PWD/token.txt:/token.txt
-        environment:
-            - service_discovery_url=https://virusdefender.net/service.php
-            - service_url=http://1.2.3.4:12358
-        ports:
-            - "0.0.0.0:12358:8080"
-```
-
 # Heartbeat request
 
   - `Method`: `POST`
-  - `X-JUDGE-SERVER-TOKEN`: `sha256(token)`
+  - `X-JUDGE-SERVER-TOKEN`: `sha256(token).hex`
   - `Content-Type`: `application/json`
 
-
 Request data
 
 ```js