toc: add docs home in tidb toc and tidb cloud toc (#9850) (#10120)
toc: add docs home in tidb toc and tidb cloud toc (#9850) (#10120)

* This is an automated cherry-pick of #9850

Signed-off-by: ti-chi-bot <040e6455cde1c91e876ec337e785ce913eacba35@tidb.io>

* resolve conflict

Signed-off-by: ti-chi-bot <040e6455cde1c91e876ec337e785ce913eacba35@tidb.io>
Co-authored-by: xixirangrang <a89af37601820133be1a0b4c981c93a48fc921da@hotmail.com>
Co-authored-by: shichun-0415 <db4800ba9d959ddf88bc4a2a5c0fb6b2a5b32d48@pingcap.com>
pingcap/docs,pingcap/docs,pingcap/docs