🌐 Add Bangali translation for `docs/bn/about/index.md` (#13882)

* add translation for docs/about/index.md

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+# সম্পর্কে
+
+**FastAPI** সম্পর্কে বিস্তারিত — এর ডিজাইন, অনুপ্রেরণা ও আরও অনেক কিছু। 🤓