settings: add BASE_URL

Signed-off-by: Bas Westerbaan <bas@westerbaan.name>
base.mail: add render_then_email

Signed-off-by: Bas Westerbaan <bas@westerbaan.name>
leden/views: convert EmailMessage to render_then_email

Signed-off-by: Bas Westerbaan <bas@westerbaan.name>
leden/api: convert EmailMessage to render_then_email

Signed-off-by: Bas Westerbaan <bas@westerbaan.name>
moderation: convert EmailMessage to render_then_email

Signed-off-by: Bas Westerbaan <bas@westerbaan.name>
subscriptions: convert EmailMessage to render_then_email

Signed-off-by: Bas Westerbaan <bas@westerbaan.name>
base/mail: fix syntax error

Signed-off-by: Bas Westerbaan <bas@westerbaan.name>
render_then_mail: remove newlines preceded by slashes

Signed-off-by: Bas Westerbaan <bas@westerbaan.name>
Merge pull request #127 from khandhas-infra/render_then_email

Gebruik templates voor e-mails