feat: 增加时光轴功能

[yaoyaoio]

Related ISSUE

Input follow ISSUE URL address

Type Of Change

• [ ] 🐞 Bug fix (non-breaking change which fixes an issue)
• [x] ✨ New feature (non-breaking change which adds functionality)
• [ ] 📝 Document (This change requires a documentation update)
• [ ] 🎨 Theme style (Theme style beautification)
• [ ] ⚠ Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] 🔨 Workflow (Workflow changes)

Clear Describe

A clear and concise description of what update for target.

Description

因个人喜欢时光轴功能 所以特此增加时光轴功能给此项目。 不知道作者是否会通过此PR 当然都没关系 我也是用了该主题很久了 然后我也是第一次学习vuepress theme 所以有可能写得不好 或者有问题 希望作者谅解。

Test Case

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test case.

[vercel[bot]]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated
v2-vuepress-theme-gungnir	✅ Ready (Inspect)	Visit Preview	Sep 13, 2022 at 11:01AM (UTC)
vuepress-theme-gungnir	❌ Failed (Inspect)		Sep 13, 2022 at 11:01AM (UTC)