[docs] Reorganize append table guides and replace diagrams with SVGs - #9719

[docs] Reorganize append table guides and replace diagrams with SVGs#9719

JingsongLi merged 2 commits into

apache:masterapache/paimon:masterfrom

JingsongLi:codex/append-table-docsJingsongLi/paimon:codex/append-table-docsCopy head branch name to clipboard