fix: delete offline "how to write a good knowledge description" helper (#9165)

web/app/components/datasets/external-knowledge-base/create/KnowledgeBaseInfo.tsx

 import React from 'react'
-import { RiBookOpenLine } from '@remixicon/react'
 import { useTranslation } from 'react-i18next'
 import Input from '@/app/components/base/input'
 
               placeholder={t('dataset.externalKnowledgeDescriptionPlaceholder') ?? ''}
               className={`flex h-20 py-2 p-3 self-stretch items-start rounded-lg bg-components-input-bg-normal ${description ? 'text-components-input-text-filled' : 'text-components-input-text-placeholder'} system-sm-regular`}
             />
-            <a
-              className='flex py-0.5 gap-1 self-stretch'
-              href='https://docs.dify.ai/features/datasets#how-to-write-a-good-dataset-description'
-              target="_blank"
-              rel="noopener noreferrer"
-            >
-              <div className='flex p-0.5 items-center gap-2'>
-                <RiBookOpenLine className='w-3 h-3 text-text-tertiary' />
-              </div>
-              <div className='flex-grow text-text-tertiary body-xs-regular'>{t('dataset.learnHowToWriteGoodKnowledgeDescription')}</div>
-            </a>
           </div>
         </div>
       </div>

web/app/components/datasets/rename-modal/index.tsx

 import type { MouseEventHandler } from 'react'
 import { useState } from 'react'
 import { RiCloseLine } from '@remixicon/react'
-import { BookOpenIcon } from '@heroicons/react/24/outline'
 import { useContext } from 'use-context-selector'
 import { useTranslation } from 'react-i18next'
 import cn from '@/utils/classnames'
               className='block px-3 py-2 w-full h-[88px] rounded-lg bg-gray-100 text-sm outline-none appearance-none resize-none'
               placeholder={t('datasetSettings.form.descPlaceholder') || ''}
             />
-            <a className='mt-2 flex items-center h-[18px] px-3 text-xs text-gray-500 hover:text-primary-600' href="https://docs.dify.ai/features/datasets#how-to-write-a-good-dataset-description" target='_blank' rel='noopener noreferrer'>
-              <BookOpenIcon className='w-3 h-[18px] mr-1' />
-              {t('datasetSettings.form.descWrite')}
-            </a>
           </div>
         </div>
       </div>

web/app/components/datasets/settings/form/index.tsx

 import { useState } from 'react'
 import { useMount } from 'ahooks'
 import { useContext } from 'use-context-selector'
-import { BookOpenIcon } from '@heroicons/react/24/outline'
 import { useTranslation } from 'react-i18next'
 import { useSWRConfig } from 'swr'
 import { unstable_serialize } from 'swr/infinite'
             value={description}
             onChange={e => setDescription(e.target.value)}
           />
-          <a className='flex items-center h-[18px] px-3 text-xs text-gray-500' href="https://docs.dify.ai/features/datasets#how-to-write-a-good-dataset-description" target='_blank' rel='noopener noreferrer'>
-            <BookOpenIcon className='w-3 h-[18px] mr-1' />
-            {t('datasetSettings.form.descWrite')}
-          </a>
         </div>
       </div>
       <div className={rowClass}>