doc(Layout): remove man z-index attribute

[ArgoZhang]

Link issues

fixes #5539
[Please fill in the relevant Issue number after the # above, such as #42]
[请在上方 # 后面填写相关 Issue 编号，如 #42]

Summary By Copilot

This pull request includes changes to the CSS files for the BaseLayout and MainLayout components in the BootstrapBlazor.Server project. The changes focus on simplifying the layout styles by removing unnecessary CSS properties.

Simplification of layout styles:

• src/BootstrapBlazor.Server/Components/Layout/BaseLayout.razor.css: Removed position: relative; and z-index: 10; from the main element.
• src/BootstrapBlazor.Server/Components/Layout/MainLayout.razor.css: Removed position: relative; and z-index: 5; from the .main class.

Regression?

• Yes
• No

[If yes, specify the version the behavior has regressed from]
[是否影响老版本]

Risk

• High
• Medium
• Low

[Justify the selection above]

Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Merge the latest code from the main branch

Summary by Sourcery

Enhancements:

• Removes the position and z-index styles from the BaseLayout and MainLayout components to simplify layout styles.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request simplifies the layout styles by removing the position: relative and z-index properties from the main element in BaseLayout.razor.css and the .main class in MainLayout.razor.css. These properties were deemed unnecessary and their removal cleans up the CSS.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Removed unnecessary position and z-index properties from the main layout elements.	Removed position: relative; and z-index: 10; from the main element in BaseLayout.razor.css. Removed position: relative; and z-index: 5; from the .main class in MainLayout.razor.css.	src/BootstrapBlazor.Server/Components/Layout/BaseLayout.razor.css src/BootstrapBlazor.Server/Components/Layout/MainLayout.razor.css

Possibly linked issues

• 关于Checkboxlist 选项bug问题 #123: The PR addresses the issue by removing the z-index attribute from the layout CSS files.

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[sourcery-ai]

Hey @ArgoZhang - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider adding a comment explaining why these properties are being removed.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (f5ce1d0) to head (c6dc2f3).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #5540   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          649       649           
  Lines        29607     29607           
  Branches      4173      4173           
=========================================
  Hits         29607     29607           

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