[zh] Page updates needed + missing link

[chalin]

• After #4634 is merged, you'll need to update the following pages

  $ ./scripts/i18n-check.sh -u
  30      30      content/en/docs/concepts/components.md - content/zh/docs/concepts/components.md
  4       5       content/en/docs/_index.md - content/zh/docs/_index.md
  1       1       content/en/_index.md - content/zh/_index.md
  

• [ ] As discussed in Keeping track of localized page drift, run scripts/i18n-check.sh -u -d to see the details diffs of the en pages
• [x] Also note that https://opentelemetry.io/zh/docs/ is missing the link to vendors. The link text in English is "supported by more than 40 observability vendors" - #4650