Avoid fsstat on every request, remove koa-static (#4387)

* Avoid fsstat on every request, remove koa-static

* tsx

* Move compression middleware

package.json

@@ -125,7 +125,6 @@
     "koa-router": "7.4.0",
     "koa-send": "5.0.1",
     "koa-sslify": "2.1.2",
-    "koa-static": "^4.0.1",
     "koa-useragent": "^4.1.0",
     "lodash": "^4.17.21",
     "mammoth": "^1.4.19",
@@ -252,8 +251,8 @@
     "@types/koa-logger": "^3.1.2",
     "@types/koa-mount": "^4.0.1",
     "@types/koa-router": "^7.4.4",
+    "@types/koa-send": "^4.1.3",
     "@types/koa-sslify": "^2.1.0",
-    "@types/koa-static": "^4.0.2",
     "@types/koa-useragent": "^2.1.2",
     "@types/markdown-it": "^12.2.3",
     "@types/markdown-it-container": "^2.0.5",