Email Templating

[alexlai18]

Implement the ability for organisations to have their own Email Templates, with adjustable variables to send to the applicants.

This ticket will involve:

• CRUD operations on the backend
• Frontend utility function to convert textbox input into HTML text

[KavikaPalletenne]

Store email templates (strings) in DB, with a relation to an organisation.

i.e. schema will look something like:

CREATE TABLE email_templates (
    id BIGINT PRIMARY KEY,
    organisation_id BIGINT NOT NULL,
    template_name TEXT NOT NULL,
    template TEXT NOT NULL
)