fix(theme-default): heading anchor doesn't display when no sidebar or minimum content area

[shulaoda]

Fixed #1092

Summary

This issue also exists without sidebar.

This is because the area size of the content padding-left is 24px, and due to the font-size of h1 being 1.875em, which is 30px, the size of the anchor's margin-left is 26.1px, so exceeding it will be hidden. In contrast, the font-size of h1 in vitepress is fixed at 28px, so this issue will not occur.

The solution is as follows:

1. Change the baseline font-size of the title
2. Expand the content area padding-left to 26px

Related Issue

1092

Checklist

• [ ] Tests updated (or not required).
• [ ] Documentation updated (or not required).

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