docs: add index page for english documentation

* docs: add kafka connector english doc

[TD-10605]

* docs: fix kafka docs

fix(client): check return value from meta hash map

[TD-10605]

docs: fix broken link

docs: fix broken link

docs: add documentation index page

fix(query): fill function with order by desc

* docs: add kafka connector documentation

* docs: refine few sections
Co-authored-by: Shuduo Sang <sangshuduo@gmail.com>

test: add test cases for state_window

docs: resolve line unfold problem in faq.md

* enh: move taosdemo in rpm and deb

[TD-15642]

* update taos-tools

* enh: add build.sh to build TDengine and taosTools in one command

[TD-15642]

* fix: mismatched name

docs: refine the format in faq.md

docs: correct a typo

docs: remove useless slug

* enh: move taosdemo in rpm and deb

[TD-15642]

* update taos-tools

* enh: add build.sh to build TDengine and taosTools in one command

[TD-15642]

docs: add link to taosAdapter in get started