space optimizations for node_modules and client stats removal

- replace sharp with lighter jimp alternative
- remove stats in builds

fixes #2807

package.json

@@ -112,6 +112,7 @@
     "ipaddr.js": "1.9.1",
     "is-cidr": "^3.0.0",
     "iso-639-3": "^2.0.0",
+    "jimp": "^0.12.1",
     "js-yaml": "^3.5.4",
     "jsonld": "~3.0.1",
     "lodash": "^4.17.10",
@@ -135,7 +136,6 @@
     "scripty": "^2.0.0",
     "sequelize": "5.21.5",
     "sequelize-typescript": "^1.0.0-beta.4",
-    "sharp": "^0.25.2",
     "sitemap": "^6.1.0",
     "socket.io": "^2.2.0",
     "srt-to-vtt": "^1.1.2",
@@ -184,7 +184,6 @@
     "@types/pem": "^1.9.3",
     "@types/redis": "^2.8.5",
     "@types/request": "^2.0.3",
-    "@types/sharp": "^0.24.0",
     "@types/socket.io": "^2.1.2",
     "@types/supertest": "^2.0.3",
     "@types/validator": "^12.0.1",