Modify dependabot.yaml to specify directories

Updated directories for npm and docker package ecosystems in dependabot configuration.

Author: ericahan22

.github/dependabot.yaml

@@ -7,7 +7,7 @@ multi-ecosystem-groups:
       - "*"
 updates:
   - package-ecosystem: "npm"
-    directory: "/"
+    directory: "/frontend"
     multi-ecosystem-group: "all-dependencies"
     patterns:
       - "*"
@@ -27,7 +27,10 @@ updates:
     patterns:
       - "*"
   - package-ecosystem: "docker"
-    directory: "/"
+    directories:
+      - "/frontend"
+      - "/backend"
+      - "/db"
     multi-ecosystem-group: "all-dependencies"
     patterns:
       - "*"