chore(deps): update dependency vitepress to v1.6.0 (#1576)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [vitepress](https://vitepress.dev/)
([source](https://redirect.github.com/vuejs/vitepress)) | [`1.5.0` ->
`1.6.0`](https://renovatebot.com/diffs/npm/vitepress/1.5.0/1.6.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/vitepress/1.6.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/vitepress/1.6.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/vitepress/1.5.0/1.6.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/vitepress/1.5.0/1.6.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>vuejs/vitepress (vitepress)</summary>

###
[`v1.6.0`](https://redirect.github.com/vuejs/vitepress/blob/HEAD/CHANGELOG.md#160-2025-01-20)

[Compare
Source](https://redirect.github.com/vuejs/vitepress/compare/v1.5.0...v1.6.0)

##### Bug Fixes

- **build:** out of order css in prod builds
([241d17d](https://redirect.github.com/vuejs/vitepress/commit/241d17d9839f06b17c3898b1a8ba0f9fa12da0d1)),
closes
[#&#8203;4098](https://redirect.github.com/vuejs/vitepress/issues/4098)
- **build:** properly strip vpi-social css declaration in debug mode
([c61182a](https://redirect.github.com/vuejs/vitepress/commit/c61182ab278350699b5d50461788478a340790aa))
- **build:** respect `vite.clearScreen` in build
([8ea776a](https://redirect.github.com/vuejs/vitepress/commit/8ea776addc2c3bcabf3c707a9a81d6e0080a8fcb)),
closes
[#&#8203;4468](https://redirect.github.com/vuejs/vitepress/issues/4468)
- **build:** specify mode for iconify
([8a5e8ea](https://redirect.github.com/vuejs/vitepress/commit/8a5e8ea4f5b7cba0a6c909d8949f0c20426104a6))
- **theme:** apply `externalLinkIcon` option on `VPHome`
([#&#8203;4492](https://redirect.github.com/vuejs/vitepress/issues/4492))
([fe48943](https://redirect.github.com/vuejs/vitepress/commit/fe48943640895d859811b81f86d78c3e510dbe54))
- **theme:** don't show external link icon for images
([096bba1](https://redirect.github.com/vuejs/vitepress/commit/096bba19fb61c4b2f8f527046b4b0fe2e91c6bd6))
- **theme:** ignore footnote-ref for outline
([1832617](https://redirect.github.com/vuejs/vitepress/commit/183261753b04c2c96ddb8c10e520c748c6d3e613)),
closes
[#&#8203;4402](https://redirect.github.com/vuejs/vitepress/issues/4402)
- **theme:** includes text to h1 tag for hero page
([#&#8203;4472](https://redirect.github.com/vuejs/vitepress/issues/4472))
([bd896c6](https://redirect.github.com/vuejs/vitepress/commit/bd896c638f8046f6546b5b32e8f98f3707aa8d05)),
closes
[#&#8203;4453](https://redirect.github.com/vuejs/vitepress/issues/4453)

##### Features

- **build:** export normalize function from shared chunk
([616f63f](https://redirect.github.com/vuejs/vitepress/commit/616f63f5f08a57347f2800e2d147d5bcd1cd072d)),
closes
[#&#8203;4401](https://redirect.github.com/vuejs/vitepress/issues/4401)
- **theme:** allow customizing skip to content label
([ff254dc](https://redirect.github.com/vuejs/vitepress/commit/ff254dcbe6f2bcc89c34d2d2f4050229dc094400)),
closes
[#&#8203;4288](https://redirect.github.com/vuejs/vitepress/issues/4288)
- **theme:** export VPNavBarSearch
([23522ab](https://redirect.github.com/vuejs/vitepress/commit/23522ab83ff33802d382fa066578dd87eb06789d)),
closes
[#&#8203;4476](https://redirect.github.com/vuejs/vitepress/issues/4476)
- **theme:** export VPFeatures
([#&#8203;4356](https://redirect.github.com/vuejs/vitepress/issues/4356))
([6442e17](https://redirect.github.com/vuejs/vitepress/commit/6442e174838aec9668325bb1199419908e7dd728))

##### Miscellaneous

- **build:** shiki transformers now use v3 [matching
algorithm](https://shiki.style/packages/transformers#matching-algorithm)
([373f9b9](https://redirect.github.com/vuejs/vitepress/commit/373f9b933ee44f33a15ebdcfcb6db6dfac52f739))

</details>

---

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