feat(guide): port remaining prs/issues from legacy (#10974)

* chore: remove await wait placeholder

prefer using an explanatory placeholder rather than this artificial
example
original issue: https://github.com/discordjs/guide/issues/1360

* chore: remove implicit grant guide and add disclaimer

issue: https://github.com/discordjs/guide/issues/1370/
pr: https://github.com/discordjs/guide/pull/1543/

* chore(sharding): improve broadcast sample and use of context argument

original PR: https://github.com/discordjs/guide/pull/1624

* feat: add page about setup with proxy

original PR: https://github.com/discordjs/guide/pull/1623

* chore: clarify hiding of commands

original PR: https://github.com/discordjs/guide/pull/1617

* feat(voice): seeking

original PR: https://github.com/discordjs/guide/pull/1483

* chore(oauth2): typo

* chore: align with rest of the guide

remove abstraction layers in ws proxy handling in favour of directly setting globals

* chore: branding over grammar

* Apply suggestions from code review

Co-authored-by: Qjuh <76154676+Qjuh@users.noreply.github.com>

* chore: remove now obsolete example explanation from comments

---------

Co-authored-by: Qjuh <76154676+Qjuh@users.noreply.github.com>

apps/guide/content/docs/voice/meta.json

@@ -8,7 +8,8 @@
 		"life-cycles",
 		"voice-connections",
 		"audio-player",
-		"audio-resources"
+		"audio-resources",
+		"seeking"
 	],
 	"root": true,
 	"icon": "Volume2"