[ci skip] Improve issue template (#229)

* [ci skip] Improve issue template

* Format

.github/ISSUE_TEMPLATE/config.yml

@@ -1 +1,5 @@
 blank_issues_enabled: true
+contact_links:
+  - name: Discord
+    url: https://discord.com/invite/gfgAwdSEuM
+    about: 在 Discord 上联系我们 | Contact us on Discord

.github/ISSUE_TEMPLATE/en_bug_report.yml

@@ -6,7 +6,7 @@ body:
   - type: markdown
     attributes:
       value: |
-        Before reporting an issue, make sure you are running the latest build of Leaf and checked for duplicate issues in [Issues](https://github.com/Winds-Studio/Leaf/issues)!
+        Before reporting an issue, make sure you are running the latest build of Leaf and checked for duplicate issues in [Issues](https://github.com/Winds-Studio/Leaf/issues) and the [Leaf docs](https://docs.leafmc.one/)!
 
   - type: checkboxes
     attributes:
@@ -14,7 +14,7 @@ body:
       description: |
         Before you scroll down, select boxes below.
       options:
-        - label: I have searched the existing issues
+        - label: I have searched the existing issues and the documentation
           required: true
         - label: I ticked all the boxes without actually reading them
           required: false

.github/ISSUE_TEMPLATE/zh_bug_report.yml

@@ -6,7 +6,7 @@ body:
   - type: markdown
     attributes:
       value: |
-        在反馈问题之前, 请确保您正在使用最新版本的 Leaf, 并浏览 [Issues](https://github.com/Winds-Studio/Leaf/issues), 检查你的问题是否已被汇报！
+        在反馈问题之前, 请确保您正在使用最新版本的 Leaf, 并浏览 [Issues](https://github.com/Winds-Studio/Leaf/issues) 和 [Leaf 文档](https://docs.leafmc.one/), 检查你的问题是否已被汇报！
 
   - type: checkboxes
     attributes:
@@ -14,7 +14,7 @@ body:
       description: |
         在浏览并填写其他选项之前, 请先勾选以下的框。
       options:
-        - label: 我已经浏览过Issue, 并确保汇报的不是已知问题
+        - label: 我已经浏览过 Issues 和 Leaf 文档, 并确保汇报的不是已知问题
           required: true
         - label: 我勾选了所有框, 因为我根本就没仔细看他们是什么
           required: false