[Docs] Add version switcher to menu (#1407)

* [Docs] Add version switcher to menu

* fix link

docs/en/conf.py

@@ -95,6 +95,15 @@ html_theme_options = {
             'name':
             'Upstream',
             'children': [
+                {
+                    'name':
+                    'MMEngine',
+                    'url':
+                    'https://github.com/open-mmlab/mmengine',
+                    'description':
+                    'Foundational library for training deep '
+                    'learning models'
+                },
                 {
                     'name': 'MMCV',
                     'url': 'https://github.com/open-mmlab/mmcv',
@@ -107,6 +116,24 @@ html_theme_options = {
                 },
             ]
         },
+        {
+            'name':
+            'Version',
+            'children': [
+                {
+                    'name': 'MMOCR 0.x',
+                    'url': 'https://mmocr.readthedocs.io/en/latest/',
+                    'description': 'Main branch'
+                },
+                {
+                    'name': 'MMOCR 1.x',
+                    'url': 'https://mmocr.readthedocs.io/en/dev-1.x/',
+                    'description': '1.x branch'
+                },
+            ],
+            'active':
+            True,
+        },
     ],
     # Specify the language of shared menu
     'menu_lang':

docs/zh_cn/conf.py

@@ -96,6 +96,11 @@ html_theme_options = {
             'name':
             '上游库',
             'children': [
+                {
+                    'name': 'MMEngine',
+                    'url': 'https://github.com/open-mmlab/mmengine',
+                    'description': '深度学习模型训练基础库'
+                },
                 {
                     'name': 'MMCV',
                     'url': 'https://github.com/open-mmlab/mmcv',
@@ -108,6 +113,24 @@ html_theme_options = {
                 },
             ]
         },
+        {
+            'name':
+            '版本',
+            'children': [
+                {
+                    'name': 'MMOCR 0.x',
+                    'url': 'https://mmocr.readthedocs.io/zh_CN/latest/',
+                    'description': 'main 分支文档'
+                },
+                {
+                    'name': 'MMOCR 1.x',
+                    'url': 'https://mmocr.readthedocs.io/zh_CN/dev-1.x/',
+                    'description': '1.x 分支文档'
+                },
+            ],
+            'active':
+            True,
+        },
     ],
     # Specify the language of shared menu
     'menu_lang':