Fix build issues (#104)

* fix linting issues on webpack.config.js

* sync with demo plugin, go mod tidy

* npm audit fix

There's a rash of lodash issues right now that have no available fix, but I'm fixing the remaining issues.

* use exact versions

* update webapp/package-lock.json too

* manually clean up go.mod/go.sum

* private package.json

.golangci.yml

@@ -49,6 +49,7 @@ issues:
   exclude-rules:
     - path: server/manifest.go
       linters:
+        - deadcode
         - unused
         - varcheck
     - path: server/configuration.go
@@ -56,5 +57,6 @@ issues:
         - unused
     - path: _test\.go
       linters:
+        - bodyclose
         - goconst
         - scopelint # https://github.com/kyoh86/scopelint/issues/4