ko: update web/glossary-b

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web/glossary-b 작업 리스트 정리

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1. bandwidth [ko]: revise index.md files for web/glossary-b #15219
2. base64 [ko]: add index.md in web/glossary/base64 #15609
3. baseline [ko]: add index.md in web/glossary/baseline #15611
4. beacon [ko]: add index.md in web/glossary/beacon #15612
5. bezier_curve [ko]: add index.md in web/glossary/bezier_curve #15614
6. bidi [ko]: add index.md in web/glossary/bidi #15615
7. bigint [ko]: revise index.md files for web/glossary-b #15219
8. binding [ko]: add index.md in web/glossary/binding #15617
9. bitwise_flags [ko]: add index.md in web/glossary/bitwise_flags #15620
10. blink [ko]: add index.md in web/glossary/blink #15624
11. block [ko]: revise index.md files for web/glossary-b #15219
12. block-level_content [ko]: revise index.md files for web/glossary-b #15219
13. block_cipher_mode_of_operation [ko]: add index.md in web/glossary/block_cipher_mode_of_operation #15636
14. boolean [ko]: revise index.md files for web/glossary-b #15219
15. bounding_box [ko]: add index.md in web/glossary/bounding_box #15639
16. breadcrumb [ko]: revise index.md files for web/glossary-b #15219
17. brotli_compression [ko]: add index.md for web/glossary/brotli_compression #15644
18. browser [ko]: revise index.md files for web/glossary-b #15219
19. browsing_context [ko]: revise index.md files for web/glossary-b #15219
20. buffer [ko]: add index.md for web/glossary/buffer #15645