Add simple count of views to share links (#4036)

* Add simple count of views to share links

* Remove no longer applicable tests

* Avoid incrementing view count for known bots

package.json

@@ -124,6 +124,7 @@
     "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",
     "markdown-it": "^13.0.1",
@@ -231,6 +232,7 @@
     "@types/emoji-regex": "^9.2.0",
     "@types/enzyme": "^3.10.10",
     "@types/enzyme-adapter-react-16": "^1.0.6",
+    "@types/express-useragent": "^1.0.2",
     "@types/formidable": "^2.0.5",
     "@types/fs-extra": "^9.0.13",
     "@types/fuzzy-search": "^2.1.2",
@@ -247,6 +249,7 @@
     "@types/koa-router": "^7.4.4",
     "@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": "^2.0.4",
     "@types/markdown-it-emoji": "^2.0.2",