Remove Bootstrap 2 and Bootstrap 4 alpha compatibility files

Test .tag to .badge changes 1. Create a few courses or use existing ones and enrol yourself in the courses 2. Hide one of the course using the course settings page 3. Navigate to your dashboard 4. Verify you see the ‘Hidden from students’ badge (It is okay if the font color is now black which is the Bootstrap default Test css class changes for spacing (p-l-x) etc 1. On your dashboard switch to the summary view 2. Inspect div that wraps the div with class progress 3. Verify it has a padding top of 1 rem. 4. Navigate to Site Administration -> Users -> Privacy and policies -> Plugin privacy registry 5. Open one of the Sections 6. Verify the spacing before the items in the section has not changed   Test css class changes for .row-fluid to .row 1. As admin open your messages using the speech bubble icon in the navbar 2. On the message drawer click the ‘See all’ link 3. This should open the full page message UI 4.* Verify* the message UI fits its container 5. Verify the UI has not changed