ko: update web/glossary-w

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1. w3c [ko]: add index.md for web/glossary/w3c #16422
2. wai [ko]: add index.md for web/glossary/wai #16423
3. wcag [ko]: add index.md for web/glossary/wcag #16424
4. web_performance [ko]: add index.md for web/glossary/web_performance #16426
5. web_server [ko]: add index.md for web/glossary/web_server #16427
6. web_standards [ko]: revise index.md files for web/glossary/w #15501
7. webassembly [ko]: add index.md for web/glossary/webassembly #16428
8. webdav [ko]: add index.md for web/glossary/webdav #16429
9. webextensions [ko]: revise index.md files for web/glossary/w #15501
10. webgl [ko]: revise index.md files for web/glossary/w #15501
11. webidl [ko]: add index.md for web/glossary/webidl #16430
12. webkit [ko]: add index.md for web/glossary/webkit #16431
13. webm [ko]: revise index.md files for web/glossary/w #15501
14. webp [ko]: revise index.md files for web/glossary/w #15501
15. webrtc [ko]: revise index.md files for web/glossary/w #15501
16. websockets [ko]: revise index.md files for web/glossary/w #15501
17. webvtt [ko]: add index.md for web/glossary/webvtt #16432
18. whatwg [ko]: revise index.md files for web/glossary/w #15501
19. whitespace [ko]: add index.md for web/glossary/whitespace #16433
20. windowproxy [ko]: add index.md for web/glossary/windowproxy #16434
21. world_wide_web [ko]: revise index.md files for web/glossary/w #15501
22. wrapper [ko]: revise index.md files for web/glossary/w #15501