Correct GitHub links in astro.config.mts

[Adammatthiesen]

This pull request updates the GitHub URLs in the documentation site configuration to use the correct repository name, ensuring that links point to the intended project.

Repository URL updates:

• Updated the GitHub social link URL in docs/astro.config.mts to use expressive-code-twoslash instead of express-code-twoslash.
• Updated the edit link base URL in docs/astro.config.mts to use expressive-code-twoslash instead of express-code-twoslash.

[changeset-bot]

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Latest commit: 063f856

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[apollo-git-bot]

Allure Report Summary

	Name	Duration	Stats	New	Flaky	Retry	Report
	css-js-gen Tests	13ms	37	94	0	0
	@ec-ts/twoslash Tests	28s 885ms	29	94	0	0
	@ec-ts/twoslash-vue Tests	6s 6ms	7	94	0	0
	@ec-ts/vfs Tests	9s 352ms	21	94	0	0