[Docs] Temporarily skip errors in building pdf docs at readthedocs (#928)

* temporarily skip readthedocs errors in building pdf docs

* fix error links

* remove useless links

* fix

* fix broken links as github url

* Update docs/zh_cn/notes/contributing.md

---------

Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>

.readthedocs.yml

@@ -1,6 +1,7 @@
 version: 2
 
-formats: all
+formats:
+    - epub
 
 python:
   version: 3.7

docs/en/advanced_tutorials/test_time_augmentation.md

@@ -4,7 +4,7 @@ Test time augmentation (TTA) is a data augmentation strategy used during the tes
 
 The core implementation of TTA is usually divided into two parts：
 
-1. Data augmentation: This part is implemented in MMCV, see the api docs [TestTimeAug](mmcv.transform.TestTimeAug) for more information.
+1. Data augmentation: This part is implemented in MMCV, see the api docs [TestTimeAug](mmcv.transforms.TestTimeAug) for more information.
 2. Merge the predictions: The subclasses of `BaseTTAModel` will merge the predictions of enhanced data in the `test_step` method to improve the accuracy of predictions.
 
 ## Get started

docs/en/notes/contributing.md

@@ -214,11 +214,11 @@ We use the following tools for linting and formatting:
 - [mdformat](https://github.com/executablebooks/mdformat): Mdformat is an opinionated Markdown formatter that can be used to enforce a consistent style in Markdown files.
 - [docformatter](https://github.com/myint/docformatter): A formatter to format docstring.
 
-Style configurations of yapf and isort can be found in [setup.cfg](../../../setup.cfg).
+Style configurations of yapf and isort can be found in [setup.cfg](https://github.com/open-mmlab/mmengine/blob/main/setup.cfg).
 
 We use [pre-commit hook](https://pre-commit.com/) that checks and formats for `flake8`, `yapf`, `isort`, `trailing whitespaces`, `markdown files`,
 fixes `end-of-files`, `double-quoted-strings`, `python-encoding-pragma`, `mixed-line-ending`, sorts `requirments.txt` automatically on every commit.
-The config for a pre-commit hook is stored in [.pre-commit-config](../../../.pre-commit-config.yaml).
+The config for a pre-commit hook is stored in [.pre-commit-config](https://github.com/open-mmlab/mmengine/blob/main/.pre-commit-config.yaml).
 
 ## PR Specs
 

docs/zh_cn/advanced_tutorials/test_time_augmentation.md

@@ -4,7 +4,7 @@
 
 TTA 的核心实现通常分为两个部分：
 
-1. 测试时的数据增强：测试时数据增强主要在 MMCV 中实现，可以参考 [TestTimeAug 的 API 文档](mmcv.transform.TestTimeAug)，本文档不再赘述。
+1. 测试时的数据增强：测试时数据增强主要在 MMCV 中实现，可以参考 [TestTimeAug 的 API 文档](mmcv.transforms.TestTimeAug)，本文档不再赘述。
 2. 模型推理以及结果融合：`BaseTTAModel` 的主要功能就是实现这一部分，`BaseTTAModel.test_step` 会解析测试时增强后的数据并进行推理。用户继承 `BaseTTAModel` 后只需实现相应的融合策略即可。
 
 ## 快速上手

docs/zh_cn/notes/contributing.md

@@ -224,10 +224,10 @@ make html
 - [mdformat](https://github.com/executablebooks/mdformat): 检查 markdown 文件的工具
 - [docformatter](https://github.com/myint/docformatter): 格式化 docstring 的工具
 
-yapf 和 isort 的配置可以在 [setup.cfg](../../../setup.cfg) 找到
+yapf 和 isort 的配置可以在 [setup.cfg](https://github.com/open-mmlab/mmengine/blob/main/setup.cfg) 找到
 
 通过配置 [pre-commit hook](https://pre-commit.com/) ，我们可以在提交代码时自动检查和格式化 `flake8`、`yapf`、`isort`、`trailing whitespaces`、`markdown files`，修复 `end-of-files`、`double-quoted-strings`、`python-encoding-pragma`、`mixed-line-ending`，调整 `requirments.txt` 的包顺序。
-pre-commit 钩子的配置可以在 [.pre-commit-config](../../../.pre-commit-config.yaml) 找到。
+pre-commit 钩子的配置可以在 [.pre-commit-config](https://github.com/open-mmlab/mmengine/blob/main/.pre-commit-config-zh-cn.yaml) 找到。
 
 pre-commit 具体的安装使用方式见[拉取请求](#2-配置-pre-commit)。