feat: join course via QR code (#350)

* chore: install dependencies

* feat: create downloadable image component

* feat: update component design and add download qr button

* feat: update file name

* feat: increase border radius

* chore: add logo svg file

* refactor: move all logic to parent component

* feat: setup writeable store variable

* chore: fix ts error

* feat: setup download function in parent comp

* chore: swap out svelte/qr comp for js comp

* feat: download speed qr code improvements

* feat: add loading state to download button

* fix: responsive adjustments

* refactoring

---------

Co-authored-by: tunny17 <tvnji01@gmail.com>
Co-authored-by: Rotimi Best <best@classroomio.com>

apps/dashboard/src/lib/utils/translations/en.json

@@ -803,6 +803,9 @@
           "go_to": "go to organization settings",
           "invite_students": "Invite Students",
           "via_link": "You can invite students via an invite link",
+          "via_qr": "You can invite students via QR",
+          "download_qr": "Download QR code",
+          "qr_downloading_snackbar": "QR code generated successfully, please wait while it downloads",
           "copy_link": "Copy link",
           "success": "Copied Successfully",
           "finish": "Finish"