fix(docs): fix and cleanup VuePress config

[kidonng]

Description

• Use relative links: so they can be picked up by VuePress
• Remove v0.45.0 migration link from the sidebar: it's been almost 1.5 years
• Fix wrong zh-TW and zh-CN config position: previously they don't have any effect
• Refactor sidebar: languages besides the en-US now have "Advanced Installation" in the sidebar, also makes the sidebar more maintainable
• Enable VuePress evergreen: make the site smaller and faster

Regarding the sidebar refactor, this is the biggest part of this PR. Currently overrides are configured so existing sidebar items stay the same, but eventually the each translated pages should have the right title and then remove the override. Refer to comments in the code.

Motivation and Context

Closes #

Screenshots (if appropriate):

How Has This Been Tested?

• I have tested using MacOS
• I have tested using Linux
• I have tested using Windows

Checklist:

• I have updated the documentation accordingly.
• I have updated the tests accordingly.

[davidkna]

@matchai Can you check GA what the impact of enabling evergreen would amount to?

[matchai]

@davidkna Great idea referring to GA!
If Analytics is anything to go by, we've had 25 IE sessions this year, with a 100% bounce rate.
If VuePress isn't shooing them off, something else might be. In any case, I think enabling evergreen is a worthwhile improvement.

[matchai]

LGTM! 👍
Thank you for tidying up the docs, @kidonng!