220-generate removed broken 'generate' dependencies and CI step

[bdebyl]

Fixes https://github.com/meltwater/drone-cache/issues/220

Proposed Changes

• Removal of generate step and its dependencies (liche, embedmd)

Description

Removed the generate CI step and Makefile target along with it's dependencies.

Checklist

• [x] Read the CONTRIBUTING document.
• [x] Read the CODE OF CONDUCT document.
• [x] Add tests to cover changes.
• [x] Ensure your code follows the code style of this project.
• [x] Ensure CI and all other PR checks are green OR
  • [x] Code compiles correctly.
  • [x] Created tests which fail without the change (if possible).
  • [x] All new and existing tests passed.
• [x] Add your changes to Unreleased section of CHANGELOG.
• [x] Improve and update the README (if necessary).
• [x] Ensure documentation is up-to-date.