[DOCS] Move HTTP, network settings, and transport topics out of modules

[debadair]

As part of the Modules reorg to improve discovery and navigation, find a better home for the following topics:

• HTTP [DOCS] Relocate HTTP module content #56386
• Network settings [DOCS] Relocate network settings content #55865
• Transport [DOCS] Relocate transport module content #55472

[elasticmachine]

Pinging @elastic/es-docs (>docs)

[elasticmachine]

Pinging @elastic/es-distributed (:Distributed/Network)