fix dead link (#1038)

demo/docs/2d_animal_demo.md

@@ -7,7 +7,7 @@
 We provide a demo script to test a single image, given gt json file.
 
 *Pose Model Preparation:*
-The pre-trained pose estimation model can be downloaded from [model zoo](https://mmpose.readthedocs.io/en/latest/animal_models.html#).
+The pre-trained pose estimation model can be downloaded from [model zoo](https://mmpose.readthedocs.io/en/latest/topics/animal.html).
 Take [macaque model](https://download.openmmlab.com/mmpose/animal/resnet/res50_macaque_256x192-98f1dd3a_20210407.pth) as an example:
 
 ```shell
@@ -109,7 +109,7 @@ python demo/top_down_video_demo_with_mmdet.py \
 **Other Animals**
 
 For other animals, we have also provided some pre-trained animal detection models (1-class models). Supported models can be found in [det model zoo](/demo/docs/mmdet_modelzoo.md).
-The pre-trained animal pose estimation model can be found in [pose model zoo](https://mmpose.readthedocs.io/en/latest/animal_models.html#).
+The pre-trained animal pose estimation model can be found in [pose model zoo](https://mmpose.readthedocs.io/en/latest/topics/animal.html).
 
 ```shell
 python demo/top_down_video_demo_with_mmdet.py \

demo/docs/2d_face_demo.md

@@ -9,7 +9,7 @@
 We provide a demo script to test a single image, given gt json file.
 
 *Face Keypoint Model Preparation:*
-The pre-trained face keypoint estimation model can be found from [model zoo](https://mmpose.readthedocs.io/en/latest/face_models.html#face-models).
+The pre-trained face keypoint estimation model can be found from [model zoo](https://mmpose.readthedocs.io/en/latest/topics/face.html).
 Take [aflw model](https://download.openmmlab.com/mmpose/face/hrnetv2/hrnetv2_w18_aflw_256x256-f2bbc62b_20210125.pth) as an example:
 
 ```shell

demo/docs/2d_hand_demo.md

@@ -9,7 +9,7 @@
 We provide a demo script to test a single image, given gt json file.
 
 *Hand Pose Model Preparation:*
-The pre-trained hand pose estimation model can be downloaded from [model zoo](https://mmpose.readthedocs.io/en/latest/hand_models.html#).
+The pre-trained hand pose estimation model can be downloaded from [model zoo](https://mmpose.readthedocs.io/en/latest/topics/hand%282d%29.html).
 Take [onehand10k model](https://download.openmmlab.com/mmpose/top_down/resnet/res50_onehand10k_256x256-e67998f6_20200813.pth) as an example:
 
 ```shell
@@ -50,7 +50,7 @@ Assume that you have already installed [mmdet](https://github.com/open-mmlab/mmd
 
 *Hand Box Model Preparation:* The pre-trained hand box estimation model can be found in [det model zoo](/demo/docs/mmdet_modelzoo.md).
 
-*Hand Pose Model Preparation:* The pre-trained hand pose estimation model can be downloaded from [pose model zoo](https://mmpose.readthedocs.io/en/latest/hand_models.html#).
+*Hand Pose Model Preparation:* The pre-trained hand pose estimation model can be downloaded from [pose model zoo](https://mmpose.readthedocs.io/en/latest/topics/hand%282d%29.html).
 
 ```shell
 python demo/top_down_img_demo_with_mmdet.py \
@@ -80,7 +80,7 @@ Assume that you have already installed [mmdet](https://github.com/open-mmlab/mmd
 
 *Hand Box Model Preparation:* The pre-trained hand box estimation model can be found in [det model zoo](/demo/docs/mmdet_modelzoo.md).
 
-*Hand Pose Model Preparation:* The pre-trained hand pose estimation model can be found in [pose model zoo](https://mmpose.readthedocs.io/en/latest/hand_models.html#).
+*Hand Pose Model Preparation:* The pre-trained hand pose estimation model can be found in [pose model zoo](https://mmpose.readthedocs.io/en/latest/topics/hand%282d%29.html).
 
 ```shell
 python demo/top_down_video_demo_with_mmdet.py \