docs: v0.2 docs in master (#21438)

current python.langchain.com is building from branch `v0.1`. Iterate on
v0.2 docs here.

---------

Signed-off-by: Weichen Xu <weichen.xu@databricks.com>
Signed-off-by: Rahul Tripathi <rauhl.psit.ec@gmail.com>
Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>
Co-authored-by: jacoblee93 <jacoblee93@gmail.com>
Co-authored-by: Leonid Ganeline <leo.gan.57@gmail.com>
Co-authored-by: Leonid Kuligin <lkuligin@yandex.ru>
Co-authored-by: Averi Kitsch <akitsch@google.com>
Co-authored-by: Nuno Campos <nuno@langchain.dev>
Co-authored-by: Nuno Campos <nuno@boringbits.io>
Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>
Co-authored-by: Eugene Yurtsev <eyurtsev@gmail.com>
Co-authored-by: Martín Gotelli Ferenaz <martingotelliferenaz@gmail.com>
Co-authored-by: Fayfox <admin@fayfox.com>
Co-authored-by: Eugene Yurtsev <eugene@langchain.dev>
Co-authored-by: Dawson Bauer <105886620+djbauer2@users.noreply.github.com>
Co-authored-by: Ravindu Somawansa <ravindu.somawansa@gmail.com>
Co-authored-by: Dhruv Chawla <43818888+Dominastorm@users.noreply.github.com>
Co-authored-by: ccurme <chester.curme@gmail.com>
Co-authored-by: Bagatur <baskaryan@gmail.com>
Co-authored-by: WeichenXu <weichen.xu@databricks.com>
Co-authored-by: Benito Geordie <89472452+benitoThree@users.noreply.github.com>
Co-authored-by: kartikTAI <129414343+kartikTAI@users.noreply.github.com>
Co-authored-by: Kartik Sarangmath <kartik@thirdai.com>
Co-authored-by: Sevin F. Varoglu <sfvaroglu@octoml.ai>
Co-authored-by: MacanPN <martin.triska@gmail.com>
Co-authored-by: Prashanth Rao <35005448+prrao87@users.noreply.github.com>
Co-authored-by: Hyeongchan Kim <kozistr@gmail.com>
Co-authored-by: sdan <git@sdan.io>
Co-authored-by: Guangdong Liu <liugddx@gmail.com>
Co-authored-by: Rahul Triptahi <rahul.psit.ec@gmail.com>
Co-authored-by: Rahul Tripathi <rauhl.psit.ec@gmail.com>
Co-authored-by: pjb157 <84070455+pjb157@users.noreply.github.com>
Co-authored-by: Eun Hye Kim <ehkim1440@gmail.com>
Co-authored-by: kaijietti <43436010+kaijietti@users.noreply.github.com>
Co-authored-by: Pengcheng Liu <pcliu.fd@gmail.com>
Co-authored-by: Tomer Cagan <tomer@tomercagan.com>
Co-authored-by: Christophe Bornet <cbornet@hotmail.com>

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   linkType: hard
 
+"xml-name-validator@npm:^5.0.0":
+  version: 5.0.0
+  resolution: "xml-name-validator@npm:5.0.0"
+  checksum: 86effcc7026f437701252fcc308b877b4bc045989049cfc79b0cc112cb365cf7b009f4041fab9fb7cd1795498722c3e9fe9651afc66dfa794c16628a639a4c45
+  languageName: node
+  linkType: hard
+
+"xmlchars@npm:^2.2.0":
+  version: 2.2.0
+  resolution: "xmlchars@npm:2.2.0"
+  checksum: 8c70ac94070ccca03f47a81fcce3b271bd1f37a591bf5424e787ae313fcb9c212f5f6786e1fa82076a2c632c0141552babcd85698c437506dfa6ae2d58723062
+  languageName: node
+  linkType: hard
+
 "xtend@npm:^4.0.0, xtend@npm:^4.0.1":
   version: 4.0.2
   resolution: "xtend@npm:4.0.2"