docs: use vitepress 1.0.0-alpha.4

[cpeaustriajc]

Made changes to the documentation to make it use vitepress v1.0.0-alpha.4. The change is not 1:1 yet but I will try to add also the other missing components that came from the old documentation to the new documentation.

Hope this pull request would help out!

Here is a video of the whole page being used to showcase what it currently looks like

Screencast from Tuesday, 19 July, 2022 11:30:41 PM PST.webm

Signed-off-by: John Carlo Austria [email protected]

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[posva]

Nice! We will have to wait until i18n is supported to not drop the Chinese documentation.