[FEATURE]Teacher dashboard

**What Functionality would you like to add or fix?**
Teacher & student

**Describe this Functionality/fix**
1.Teachers should be able to add topics to a subject
2.Teachers should be able to upload video lessons and add notes,quizes and cats to a subject's topic
3.Students invited to an organisation should be able to enroll into classes and subjects
4.Students should be able to access all the content posted by teachers in the classes and subjects they have enrolled into

**Duplicate prevention**
No one has done this issue

No files or tests are named. Start by locating the existing subject, class, and organisation flows in the frontend, then determine how content and enrollment are currently represented. Done means teachers can manage topic content and students can enroll and access the content for their classes and subjects.

Written by the indexing model from the issue text.