revert back ingridient "cont_type_define_course_contbook.md

Author: nawabahmadreshi

ingredients/faqs/cont_type_define_course_contbook.md

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+The difference between a Course, Content and Book are undelined below:  
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+- **Content** is a complete learning unit that can be used by any user. Content can be of several types, for example; course, textbook, lesson, worksheet, etc.
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+- **Course** is content provided in sequence, broken down in modules, open for enrolment and completion for a duration. You can attach prerequisites for a course, and it may contain assessments.
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+- **Book** is a collection of content units. It can be compiled or curated from school textbooks that conform to syllabi of state or central boards, for a grade, in the said medium of instruction and language. Text books may also be compiled separately without adhering to any syllabus, but forming a logical unit of content pieces for the given subject matter.