feat: proctoring & prerequisite settings and page alerts (#816)

* feat: add proctoring exam link to actions

* feat: prerequisite settings in advanced tab

* refactor: use formik for configuration modal in outline

* feat: proctoring exam settings in subsection configuration

test: prereq & proctoring settings

* feat: outline alerts

test: outline page alerts

* refactor: replace highlights badge with bubble

* feat: discussion badge in outline

* refactor: status bar style and date format

* Fix spacing between checklist and highlights button
* Fix title alignment in status bar
* Align learn more link to center with respect to button
* Update start date display in local format

* fix: unit url

* refactor: redesign item header

* move status to end of card
* move edit icon next to title
* make it visible on hover

* test: improve coverage

* refactor: update messages and alert colors

.gitignore

@@ -20,3 +20,6 @@ temp/babel-plugin-react-intl
 /temp
 /.vscode
 /module.config.js
+
+# Local environment overrides
+.env.private