chore: update issue template (#5407)

#### What type of PR is this?

/kind improvement

#### What this PR does / why we need it:

移除 issue 模板中的 **在线站点地址** 输入框，在正常情况下，系统信息中已经包含了外部访问地址。

#### Does this PR introduce a user-facing change?

```release-note
None
```

.github/ISSUE_TEMPLATE/bug_report.en.yml

@@ -28,14 +28,6 @@ body:
         - Docker Compose
         - Fat Jar
         - Source Code
-  - type: input
-    id: site-url
-    attributes:
-      label: "Your site address."
-      description: "Note your online address, if possible."
-      placeholder: "ex. https://halo.run"
-    validations:
-      required: false
   - type: markdown
     id: details
     attributes:

.github/ISSUE_TEMPLATE/bug_report.zh.yml

@@ -29,14 +29,6 @@ body:
         - Docker Compose
         - Fat Jar
         - Source Code
-  - type: input
-    id: site-url
-    attributes:
-      label: "在线站点地址"
-      description: "如果可以的话，请提供你的站点地址。这可能会帮助我们更好的定位问题。"
-      placeholder: "ex. https://halo.run"
-    validations:
-      required: false
   - type: markdown
     id: details
     attributes: