chore(#1465): merge messaging docs under the same section

[andrablaj]

Description

Merge Messaging docs under the same Building section.

#1465

License

The software is provided under AGPL-3.0. Contributions to this project are accepted under the same license.

[mrjones-plip]

Link checker FTW! Was so easy! Just worked!

docker exec  cht-hugo .github/scripts/check.urls.sh

Are you on a test branch and is hugo running on http://localhost:1313 ?



Fetching URLs from production.

Checking 435 URLs, be patient.  Any non 200 URLs will be listed here:

http://localhost:1313/building/features/messaging/ Is redirected! Result is:
    -> http://localhost:1313/building/messaging/ 200 
http://localhost:1313/building/guides/messaging/sms-states/ Is redirected! Result is:
    -> http://localhost:1313/building/messaging/sms-states/ 200 
http://localhost:1313/building/guides/messaging/shortcodes/ Is redirected! Result is:
    -> http://localhost:1313/building/messaging/shortcodes/ 200 
http://localhost:1313/building/guides/messaging/message-loops/ Is redirected! Result is:
    -> http://localhost:1313/building/messaging/message-loops/ 200 
http://localhost:1313/building/guides/messaging/ Is redirected! Result is:
    -> http://localhost:1313/building/messaging/ 200 
Successfully checked 435 URLs!

🚢 🪨 🔛