## Motivation

- Create the `main` branch

## Modification

Modify links from `dev-1.x` to `main`

## Motivation

The registry now supports auto-import modules from the given location.

register_all_modules before running is no longer needed. The modules
will be lazy-imported during building.

- [x] This PR can be merged after
https://github.com/open-mmlab/mmengine/pull/643. The MMEngine version
should be updated.

Ref: https://github.com/open-mmlab/mmdetection/pull/9143

Add English version of `datasets.md`, the Chinese version is in
https://github.com/open-mmlab/mmsegmentation/pull/2387

.

Co-authored-by: MeowZheng <meowzheng@outlook.com>

* [Doc] MMSeg 1.x Documentation

* revise index