docs: improve IBC guide (#6472)

* docs: improve IBC guide

* remove module specs

* capability spec

* update capability spec

* move cap to concepts

* remove module specs

* split IBC section

* wip integration.md

* complete integration.md

* format integration.md

* docs updates

* Apply suggestions from code review

Co-authored-by: colin axner <25233464+colin-axner@users.noreply.github.com>

* fix Next links

* further readings

Co-authored-by: colin axner <25233464+colin-axner@users.noreply.github.com>

docs/package-lock.json

@@ -6903,8 +6903,7 @@
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-      "optional": true
+      "integrity": "sha512-q0M/9eZHzmr0AulXyPwNfZjtwZ/RBZlbN3K3CErVrk50T2ASYI7Bye0EvekFY3IP1Nt2DHu0re+V2ZHIpMkuWg=="
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     "pify": {
       "version": "4.0.1",