General cleanup tasks (#22)

* docs: correct GFM syntax for admonitions

* fix: use group() func for last two command groups

README.md

@@ -17,7 +17,7 @@ as part of the Nix store.
 There is also an `altf4` user baked into all images that has a list of trusted
 SSH keys on it. This user is for administrative purposes. 
 
-> ![NOTE]
+> [!NOTE]
 > On AMIs, the SSH keypair for `altf4` will not be overridden by setting the
 > SSH Key Pair option when provisioning the AMI. That option only applies to
 > the `root` user.
@@ -54,7 +54,7 @@ $ just build ecs-node
 
 ### Publishing an AMI to EC2
 
-> ![NOTE]
+> [!NOTE]
 > Using this if you're not a member of ALT-F4 requires some more steps. See
 > [`aws/README.md`](./aws/README.md) for more info.
 

ci-build-publish.sh

@@ -67,15 +67,15 @@ echo "New snapshot is $snapshot_id."
 ciout snapshot_id "$snapshot_id"
 endgroup
 
-echo "::group::Registering new AMI"
+group "Registering new AMI"
 ami_id=$(aws ec2 register-image --architecture x86_64 --ena-support --name "$image_name" --description "A NixOS AMI: {{profile}}" --block-device-mappings "DeviceName=/dev/sda1,Ebs={SnapshotId=$snapshot_id}" --root-device-name /dev/sda1 | jq .ImageId)
 echo "AMI is registered: $ami_id"
 ciout ami_id "$ami_id"
-echo "::endgroup::"
+endgroup
 
-echo "::group::Cleaning up image VHD from bucket"
+group "Cleaning up image VHD from bucket"
 aws s3 rm "s3://$bucket/$image_name.vhd"
-echo "::endgroup::"
+endgroup
 
 cisum "# :rocket: AMI build successful"
 cisum ""