Removed encoding parameter from pygeoapi config

[ricardogsilva]

Overview

This PR removes the encoding configuration parameter. As discussed in #1521, this parameter only affected the charset of gzipped responses and was thus not being used very consistently. This proposed implementation simply removes this parameter from pygeoapi config and therefore makes gzipped responses use the default charset of utf-8, which is what the normal, non-gzipped responses were already doing.

Related issue / discussion

• Fixes Do not provide an option to choose charset for compressed GZIP responses #1521

Dependency policy (RFC2)

• I have ensured that this PR meets RFC2 requirements

Updates to public demo

• I have ensured that breaking changes to the pygeoapi master demo server have been addressed
  • https://github.com/geopython/demo.pygeoapi.io/blob/master/services/pygeoapi_master/local.config.yml

Contributions and licensing

(as per https://github.com/geopython/pygeoapi/blob/master/CONTRIBUTING.md#contributions-and-licensing)

• I'd like to contribute [feature X|bugfix Y|docs|something else] to pygeoapi. I confirm that my contributions to pygeoapi will be compatible with the pygeoapi license guidelines at the time of contribution
• I have already previously agreed to the pygeoapi Contributions and Licensing Guidelines

[ricardogsilva]

CI error is not related to the changes in this PR - it is a manifestation of #1517

[github-actions]

This Pull Request has been inactive for 90 days. As per RFC4, in order to manage maintenance burden, it will be automatically closed in 7 days.

[github-actions]

As per RFC4, this Pull Request has been closed due to there being no activity for more than 90 days.