fix(er): fix nextLesson and addModuleWithResources for stand alone lessons

[nicollguarnizo]

With the changes made in this PR https://github.com/skillrecordings/products/pull/1691 we broke the tutorials since the also use exercise-template

• this fixes the tutorials 404
• includes the stand alone lessons in the LessonList component and style them
• fixes the nextLesson query

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