### _Why are the changes needed?_
- Move the configuration docs to the top level of docs, which is most commonly used and referenced
- update relevant doc links
### _How was this patch tested?_
- [x] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [x] [Run test](https://kyuubi.readthedocs.io/en/master/contributing/code/testing.html#running-tests) locally before make a pull request
Closes#5154 from bowenliang123/config-doc-first.
Closes#5154
b49ed3f8b [liangbowen] nit
db7f0d14d [liangbowen] update doc links
f8fd697a2 [liangbowen] move config docs to the top level
7448e4487 [liangbowen] change title of settings doc
40214ddd8 [liangbowen] move config doc in the front of deployment
Authored-by: liangbowen <liangbowen@gf.com.cn>
Signed-off-by: liangbowen <liangbowen@gf.com.cn>
ab1c46d431