docs: ics27 v6 documentation updates (backport #2561)

[mergify]

This is an automatic backport of pull request #2561 done by Mergify.
Cherry-pick of 47e1c9a has failed:

On branch mergify/bp/release/v6.0.x/pr-2561
Your branch is up to date with 'origin/release/v6.0.x'.

You are currently cherry-picking commit 47e1c9a.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   docs/.vuepress/config.js
	modified:   docs/apps/interchain-accounts/active-channels.md
	modified:   docs/apps/interchain-accounts/auth-modules.md
	modified:   docs/apps/interchain-accounts/integration.md
	new file:   docs/apps/interchain-accounts/messages.md
	modified:   docs/apps/interchain-accounts/overview.md
	modified:   docs/apps/interchain-accounts/parameters.md
	deleted:    docs/apps/interchain-accounts/transactions.md

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   docs/package-lock.json

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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