- Replace uses of deprecated Bourbon helpers with raw CSS
- Add autoprefixer into the build chain to prefix the now removed helpers
This process was achieved by running through each of the deprecation warnings and using the following bash function to replace it in all files:
```
function bourbon-deprecate() {
grep -rl "@include $1" ./frontend --exclude-dir=.git | xargs sed -i '' -E "s/@include $1[(](.*)[)]/$1: \1/g"
}
```
For some helpers, this did not result in valid CSS, so manual modifications were made.
Closes#1189#1274
* Removing requirment for org avatar
* Convert /setup to multiple forms
* Getting kinks worked out of Enter key
* Fixing typescript nonesense linting issues
* AppSettingsPage at /admin/settings
* Adds App Settings to site nav items
* SMTP not configured warning
* Creates AppConfigForm
* Avatar preview
* API client to update app config
* Creates OrgLogoIcon component
* Hide username/password when no auth type
