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- Remove a unused dependency. This dependency was added to handle YAML 'frontmatter' meta, parsing them and converting them to a table or details in the resulting HTML. As can be read in the issue that reported the behavior of YAML frontmatter being rendered literally, https://github.com/go-gitea/gitea/issues/5377. - It's an unused dependency as the codebase since then moved on to do this YAML parsing and rendering on their own, this was implemented in 812cfd0ad9bb85b13ce77f611b3c80dad371d1ef. - Adds unit tests that was related to this functionality, to proof the codebase already handles this and to prevent regressions.
