Enable Eduhelx deployment with two HeLx instances in one namespace

[Hoid]

Note: I didn't change the LICENSE file myself, I think that's being done by a Github Action because I tried to restore it and it went back to being changed.

• Set the postgresql db host to be ("appstore.fullname") + "postgresql" instead of .Release.Name + .Values.db.host. This in effect allows us to set the appstore.fullname in the values file to just be whatever we want or defeault to "appstore", and not have to worry about the release name changing the db host.
• Delete some secrets that were being created but not used by anything
• Put some secrets that are being used behind feature flags in the values file, defaulted to on. This allows us to turn these secret deployments off for things like Eduhelx, when doing a double deployment of appstore would have a collision of these secrets with the same name (the reason we can't just change the name is that tycho expects them to be of the name "-env", which is inane but that's where we're at).