Fixes from manual testing email sending

src/docker-compose.yml

@@ -30,6 +30,9 @@ services:
       # --- These keys are obtained from `.env` file ---
       # Set a private JWT signing key for Login.gov
       - DJANGO_SECRET_LOGIN_KEY
+      # AWS credentials
+      - AWS_ACCESS_KEY_ID
+      - AWS_SECRET_ACCESS_KEY
     stdin_open: true
     tty: true
     ports:

src/registrar/templates/emails/submission_confirmation.txt

@@ -1,4 +1,4 @@
 Thank you for submitting an application for the domain name "{{ domain_name }}".
 
 If you need to make changes to your application, visit
-<http://registrar.get.gov/application/{{ id }/edit}>.
+<http://registrar.get.gov/application/{{ id }}/edit>.

src/registrar/utility/email.py

@@ -26,7 +26,9 @@ def send_templated_email(template_name: str, to_address: str, context={}):
         FromEmailAddress=settings.DEFAULT_FROM_EMAIL,
         Destination={"ToAddresses": [to_address]},
         Content={
+            "Simple": {
                 "Subject": {"Data": "Thank you for applying for a .gov domain"},
                 "Body": {"Text": {"Data": email_body}},
             },
+        },
     )