Adds lesson 06 as well as fixes up some code inconsistencies. Adds docregions to some lessons and adds a missed step, misspellings and more to previous lessons.
PR Close#49980
This commit does the following:
- Add the instructional content for lesson 05
- Add an entry to navigation.json for this lesson
- Adds doc regions to the housing-location.component file
- Adds a placeholder for lesson 06 (that way links work now)
PR Close#49980
Update the tutorial for lesson 04 on interfaces. Also added images required for the base app. Created the placeholder for the next lesson so the app works if built from this branch. Updated navigation to include this step in the navigation menu.
PR Close#49980
