Updated docs website

* Added "Edit this page" box
* Fixed link styles
* Fixed build-time errors
* Updated VuePress and dependencies

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## Description


<!-- Add a description of the changes that this PR introduces and the files that
are the most critical to review.
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Closes: #XXX
______

For contributor use:

- [ ] Wrote tests
- [ ] Updated CHANGELOG_PENDING.md
- [ ] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
- [ ] Updated relevant documentation (`docs/`) and code comments
- [ ] Re-reviewed `Files changed` in the Github PR explorer
- [ ] Applied Appropriate Labels

docs/package.json

@@ -1,11 +1,10 @@
 {
   "name": "docs",
   "version": "1.0.0",
-  "description": "Welcome to the Tendermint Core documentation!",
+  "description": "Tendermint Core Documentation",
   "main": "index.js",
   "dependencies": {
-    "@vuepress/plugin-google-analytics": "^1.4.1",
-    "vuepress-theme-cosmos": "^1.0.161"
+    "vuepress-theme-cosmos": "^1.0.163"
   },
   "scripts": {
     "preserve": "./pre.sh",