doc/03-Configuration.md: Environment Variables #897
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New ways to configure Icinga DB were introduced in #831 and Icinga/icinga-go-library#113. The first change allows configuring Icinga DB using environment variables instead of or next to the YAML configuration file. In addition, the second change allows setting certificates and keys as PEM-encoded strings next to referencing files. This was now documented.
As a structural change, the order of the Database and Redis sections were changed to reflect the order in the example configuration file.
Some words about the Logging Components were written, as the documentation previously that they exist.
Requires: