* [TD-12520]<docs>: refine docker documents.

* update taosadapter part

* remove manually launch taosadapter section

* update English version

* [TD-12520]<docs>: refine doc for docker usage

* [TD-13307]<docs>: add description to docs index.

* fix the link of how to use taosBenchmark

* fix wrong links

add extra prompt for taosTools

[TD-13005] <doc> del alert doc

* [TD-12899]<fix>(taosAdapter): make taosd/taosAdapter service decouple

* [TD-12899]<fix>(taosAdapter): document refine

* [TD-12899]<fix>(taosAdapter): change run_taosd.sh to run_taosd_and_taosadapter.sh

* [TD-12899]<fix>(taosAdapter): check platform

* [TD-12899]<fix>(taosAdapter): check platform

change to _branch for taosAdapter version

* [TD-12899]<fix>(taosAdapter): taosd and taosAdapter decouple

use taosBenchmark rather than taosdemo

* [TD-12899]<fix>(taosAdapter): taosd and taosAdapter decouple

use 2.4.0.4 docker image in example

* [TD-12899]<fix>(taosAdapter): taosd and taosAdapter decouple

update taosadapter.service

del centos 6

* [TD-6420]<docs>: update README.md for apt-get install.

* add section to getting-started part.

[TECO-37]

[TD-1638]