ci: added codesandbox build preview for PR reviews (#1193)

* ci: added codesandbox build preview for PR reviews

* ci: codesandebox config changes

* ci: config update codesandbox

* ci: changed the sandbox element

* ci: changed sandbox to ./docs

* ci: used absolute path for sandbox

* ci: update codesandbox config

* ci: added docsify-template to sandbox

* ci: added id for docsify-template

Co-authored-by: Joe Pea <joe@trusktr.io>

Author: anikethsaha

Diff for: .codesandbox/ci.json

@@ -0,0 +1,4 @@
+{
+  "sandboxes": ["2d17z"],
+  "packages": [".", "packages/docsify-server-renderer"]
+}