Config improvements - rename file & remove default (#1103)

* Rename config.dev.toml to config-example.toml

* Updating helm docs to point to the new helm chart repository (#1102)

* Updating helm docs to point to the new helm chart repository

Fixes https://github.com/gomods/athens/issues/1099
Follow-up to https://github.com/gomods/athens/pull/1097/files

* fixes

* Helm chart: Fix ingress setup (#1086)

* Helm chart: Fix ingress setup

The ingress part of the Helm chart contained references to
not-existing templates and values. Additionally, the deployment used
some no longer available health-check URLs which prevented it from
being marked as ready.

* Make readiness and liveness paths depend on the image.tag

* Add read from .athens.toml (from pwd, then home)

* Remove config lookup from HOME

* Revert "Rename config.dev.toml to config-example.toml"

This reverts commit 9c02956406.

* Fix comment

config.dev.toml

@@ -2,6 +2,9 @@
 # Most properties can be overridden with environment variables specified in this file
 # Most properties also have defaults (mentioned in this file) if they are not set in either the config file or the corresponding environment variable
 
+# If you put this file where you start Athens from as "athens.toml", athens will use it when starting.
+# You can also start athens with -config_file as command line argument to point out a config file.
+
 # GoBinary returns the path to the go binary to use. This value can be a name of a binary in your PATH, or the full path
 # Defaults to "go"
 # Env override: GO_BINARY_PATH