[K8S only] Doc and website tools support

[geraldpereira]

• MKdocs
• Hugo

Create an ingress rule along with the container when serving the application. Can't be done on docker as the routing is static in HAProxy.

Regroup code related to gatling in a single place:

• Put all maven modules under gatling (gatling, analysis and parser)
• Rename the documentation openAPI from analysis to gatling
• Regroup the frontend libraries (analysis) into the gatling application