DOC: Please replace SERP_API examples with an alternative
Labels: name: auto:documentation

### Issue with current documentation:

We shouldn't have to sign up for another API just to follow the quickstart tutorial. Please replace this with something that doesn't require sign-up.

### Idea or request for content:

Proposal: Use `http://api.duckduckgo.com/?q=x&format=json`

Example:
`http://api.duckduckgo.com/?q=langchain&format=json`

`{"Abstract":"LangChain is a framework designed to simplify the creation of applications using large language models. As a language model integration framework, LangChain's use-cases largely overlap with those of language models in general, including document analysis and summarization, chatbots, and code analysis.","AbstractSource":"Wikipedia","AbstractText":"LangChain is a framework designed to simplify the creation of applications using large language models. As a language model integration framework, LangChain's use-cases largely overlap with those of language models in general, including document analysis and summarization, chatbots, and code analysis.","AbstractURL":"https://en.wikipedia.org/wiki/LangChain","Answer":"","AnswerType":"","Definition":"","DefinitionSource":"","DefinitionURL":"","Entity":"software","Heading":"LangChain","Image":"/i/d6fad29d.png","ImageHeight":270,"ImageIsLogo":1,"ImageWidth":529,"Infobox":{"content":[{"data_type":"string","label":"Developer(s)","value":"Harrison Chase","wiki_order":0},{"data_type":"string","label":"Initial release","value":"October 2022","wiki_order":1},{"data_type":"string","label":"Repository","value":"github.com/hwchase17/langchain","wiki_order":2},{"data_type":"string","label":"Written in","value":"Python and JavaScript","wiki_order":3},{"data_type":"string","label":"Type","value":"Software framework for large language model application development","wiki_order":4},{"data_type":"string","label":"License","value":"MIT License","wiki_order":5},{"data_type":"string","label":"Website","value":"LangChain.com","wiki_order":6},{"data_type":"twitter_profile","label":"Twitter profile","value":"langchainai","wiki_order":"102"},{"data_type":"instance","label":"Instance of","value":{"entity-type":"item","id":"Q7397","numeric-id":7397},"wiki_order":"207"},{"data_type":"official_website","label":"Official Website","value":"https://langchain.com/","wiki_order":"208"}],"meta":[{"data_type":"string","label":"article_title","value":"LangChain"},{"data_type":"string","label":"template_name","value":"infobox software"}]},"Redirect":"","RelatedTopics":[{"FirstURL":"https://duckduckgo.com/c/Software_frameworks","Icon":{"Height":"","URL":"","Width":""},"Result":"<a href=\"https://duckduckgo.com/c/Software_frameworks\">Software frameworks</a>","Text":"Software frameworks"},{"FirstURL":"https://duckduckgo.com/c/Artificial_intelligence","Icon":{"Height":"","URL":"","Width":""},"Result":"<a href=\"https://duckduckgo.com/c/Artificial_intelligence\">Artificial intelligence</a>","Text":"Artificial intelligence"}],"Results":[{"FirstURL":"https://langchain.com/","Icon":{"Height":16,"URL":"/i/langchain.com.ico","Width":16},"Result":"<a href=\"https://langchain.com/\"><b>Official site</b></a><a href=\"https://langchain.com/\"></a>","Text":"Official site"}],"Type":"A","meta":{"attribution":null,"blockgroup":null,"created_date":null,"description":"Wikipedia","designer":null,"dev_date":null,"dev_milestone":"live","developer":[{"name":"DDG Team","type":"ddg","url":"http://www.duckduckhack.com"}],"example_query":"nikola tesla","id":"wikipedia_fathead","is_stackexchange":null,"js_callback_name":"wikipedia","live_date":null,"maintainer":{"github":"duckduckgo"},"name":"Wikipedia","perl_module":"DDG::Fathead::Wikipedia","producer":null,"production_state":"online","repo":"fathead","signal_from":"wikipedia_fathead","src_domain":"en.wikipedia.org","src_id":1,"src_name":"Wikipedia","src_options":{"directory":"","is_fanon":0,"is_mediawiki":1,"is_wikipedia":1,"language":"en","min_abstract_length":"20","skip_abstract":0,"skip_abstract_paren":0,"skip_end":"0","skip_icon":0,"skip_image_name":0,"skip_qr":"","source_skip":"","src_info":""},"src_url":null,"status":"live","tab":"About","topic":["productivity"],"unsafe":0}}`