feat: add base44 entity schemas reference

feat: add issue template
feat: add labels.yml with platform:admin label
feat: add setup_admin_console.sh script and update Makefile

This commit introduces several new features and files to the
repository:

- Adds a reference document for Base44 entity schemas to
 ensure data integrity during the migration to the new
 GCP/Firebase backend.
- Adds an issue template to standardize issue reporting and
 ensure all necessary information is included.
- Adds a new label to `labels.yml` for tasks specific to the
 Admin Console web app.
- Adds a shell script to automate the setup of the Admin
 Console web application, including scaffolding,
 dependency installation, and configuration. Also updates
 the Makefile to include new targets for managing the Admin
 Console application.
- Adds issues to create markdown file.

labels.yml

@@ -31,6 +31,9 @@
 - name: "platform:backend"
   description: "Tasks for Data Connect or Cloud Functions"
   color: "5319e7"
+- name: "platform:admin"
+  description: "Tasks specific to the Admin Console web app"
+  color: "5319e7"
 
 # For Project Management
 - name: "sred-eligible"