[Optimization-367][core] Optimization explainSql return all error

[Document-365] [doc] add  question

[fix-363][metadata-hive] fix hive getSqlGeneration Exception

add docker support

[Fix-358] [pom] Fix to  install

[Feature-355][admin,executor] Restore the job from a savepoint path i…

[fix-350][alert] feishu alert when choose @all sendMsg failed bug

[Fix-347] [alert] Fix to the latest configuration take effect during …

[Document-345][doc] Fix document

 [Feature-339][admin,web] Add alarmMsg sending test

[Optimization-3443][doc] Add sidebar dinky logo

Modify the document file to lower case

[Document-336][doc] Modify document

[Optimization-334][doc, alert] Optimizati关于 doc 在dex && Optimization Misspelled words 

[Document-332][docs] Add flinksql Development Guide

[Optimize-330][docs]  Optimize official documents 

[Fix-328][docs]Modify the Chinese and English navigation bar and sidebar

[Document-326][doc] Modify introduction and concept and feature