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Support for backtick (pre) in BonzaiMark

Now that the conventional way to maintain documentation for Bonzai stateful command trees is through the use of Go’s amazing embed package full support for backticks can be added. Before, this wasn’t possible because the documentation was inline within the main cmd.go source. But now, the entire file is loaded into a string making it very easy, much easier than the `` template-heavy approach.