docs(lesson,02): add `$or` and `$and` section
docs(lesson,02): add 'Querying Inside Arrays: `$all` and `$in`' section
docs(lesson,02): add 'Queries with Dot Notation' section
docs(lesson,02): add 'Cursor' section
docs(lesson,02): add 'Count' section
docs(lesson,02): add 'Updating of a Document' section
docs(lesson,02): add 'Upserts' section
docs(lesson,02): add 'Multi-update' section
docs(lesson,02): add 'Remove data: `remove()`, `drop()`' section
docs(lesson,02): add 'Homeworks' section and solutions
feat(lesson,02): add homework and resources