Document usage of a proxy to access the network

The Java buildpack support deployments where a proxy is used to access
the Internet or local network but this is not documented. This commit
documents this support.

[#76620036]
Merge branch 'cgfrost-76620036-https-docs'
Expand the documentation around Spring profiles

This commit adds information about Spring profiles to the documentation for
auto-reconfiguration. It also expands the documentation about Spring profiles
for each of the relavent containers.

[#76772236]
Merge branch 'cgfrost-76772236-better-document-spring-profiles'

[resolves #86]