feat: mock exercise template api (#613)

* feat: move mock exercise template to api

* feat: add template migration file

* chore:
- remove exercise templates form api
- rework api to pull exercise templates from db
- add exercise template seed to seed file
- declutter seed file

* chore:
- refactor template fetch to be dependent on the selected tag
- add tag to schema, remote db and template's seed file
- clear remote db's template table and replace data and their respective tags

* chore: add number of questions and center loading screen on the frontend

* chore: pr fixes

* chore: type fixes

* chore:
- move seed functionality to /seed folder
- add typing for individual seed functions
- pr fixes

* chore: pr fixes v2

* update output css

* refactor: update seeding script and schema definitions

- Renamed `seedTypes` to `seedQuestionTypes` for clarity in the seeding process.
- Enhanced the seeding script to include a command-line interface for better usability, allowing specific seed functions to be executed based on flags.
- Removed redundant unique constraints in the schema definitions for `courseNewsfeedComment` and `exerciseTemplate` to streamline database structure.

* feat: add email verification error handling page and update session management

- Introduced a new page for handling email verification errors, providing user-friendly messages based on error types.
- Updated session management logic to improve handling of public routes and session states.
- Enhanced security policies in the Svelte configuration to include additional sources for styles and scripts.
- Removed the old email verification error page to streamline the codebase.

* move the exercise template to cloudflare cdn

---------

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

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

@@ -833,7 +833,10 @@
             "add_note": "Please add a note to use this feature",
             "generate": "Generate",
             "completion": "AI Generation Complete",
-            "click_generate": "Click 'Generate' for some magic"
+            "click_generate": "Click 'Generate' for some magic",
+            "errors": {
+              "template_fetch": "Error fetching templates. Please try again."
+            }
           },
           "all_exercises": {
             "heading": "All Exercise",

apps/dashboard/src/lib/utils/types/index.ts

@@ -33,6 +33,7 @@ export interface CustomQuestionType {
 export interface ExerciseTemplate {
   title: string;
   description: string;
+  questions?: number;
   questionnaire: {
     questions: {
       title: string;