This allows logos to be displayed for sponsors in HTML on the homepage.
The markdown will continue to list sponsors in text but the list will be pulled from the new XML.
The Perl processing of config.yaml put hard limits on the format of that file. To allow flexibility in the file format remove all Perl processing on config.yaml.
This is just the beginning of migrating the preprocessor to C but even this small bit allows the removal of a lot of Perl code.
The primary source for project info is now src/version.h.
The pgBackRestDoc::ProjectInfo module loads the project info from src/version.h at runtime so there is no need to update it.
This is consistent with the way BackRest and BackRest test were renamed way back in 18fd2523.
More modules will be moving to pgBackRestDoc soon so renaming now reduces churn later.