Generating thumbnails. Added site overview page.

package.json

@@ -64,6 +64,7 @@
     },
     "dependencies": {
         "bhttp": "^1.2.4",
+        "blake2": "^4.0.0",
         "bluebird": "^3.5.4",
         "body-parser": "^1.19.0",
         "cheerio": "^1.0.0-rc.2",
@@ -86,6 +87,7 @@
         "prop-types": "^15.7.2",
         "react": "^16.8.6",
         "react-dom": "^16.8.6",
+        "sharp": "^0.23.2",
         "tough-cookie": "^3.0.1",
         "tty-table": "^2.7.0",
         "vue": "^2.6.10",