GitLab

* [doc] clean up outdated docs

* [doc] fix linking

* [doc] fix linking

* add compatibility matrix for shardformer doc

* update tp doc

* create shardformer doc files

* add docstring for seq-parallel

* update ShardConfig docstring

* add links to llama example

* add outdated massage

* finish introduction & supporting information

* finish 'how shardformer works'

* finish shardformer.md English doc

* fix doctest fail

* add Chinese document

* [doc] add test info

* [devops] update doc check ci

* [devops] add debug info

* [devops] add debug info

* [devops] add debug info

* [devops] add debug info

* [devops] add debug info

* [devops] add debug info

* [devops] add debug info

* [devops] add debug info

* [devops] add debug info

* [devops] add debug info

* [devops] remove debug info and update invalid doc

* [devops] add essential comments

Display format optimization, fix bug#3562
Specific changes
1. "This is called a column-parallel fashion" Translate to Chinese
2. use the ```math code block syntax to display a math expression as a block, No modification of formula content

Please check that the math formula is displayed correctly
If OK, I will change the format of the English version of the formula in parallel