feat: cloud sync playground (#662)

* feat: add workspace playground page
* feat: add all demands to playground

Co-authored-by: tzhangchi <terry.zhangchi@outlook.com>

.github/ISSUE_TEMPLATE/config.yml

@@ -1,4 +1,4 @@
-blank_issues_enabled: false
+blank_issues_enabled: true
 contact_links:
   - name: 💭 Questions and Help - Reddit
     url: https://www.reddit.com/r/Affine/

.github/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,7 @@
+---
+name: I have a question
+about: Feel free to ask us your questions!
+title: '[Question]'
+labels: ''
+assignees: ''
+---