Remove npm dependabot updates for docs directory (#6887)

### Description
Removes the npm package ecosystem configuration from Dependabot for the
`docs/` directory. This disables automated dependency updates for npm
packages in the documentation folder.

### Changes
- Removed the npm Dependabot configuration block that was set to check
for minor and patch updates weekly in the `docs/` directory

### PR Checklist
- [x] All necessary documentation has been adapted.
- [x] The implemented feature is covered by appropriate, automated
tests.
- [x] Any manual testing that has been done is documented (i.e. what
exactly was tested?)

**Note:** This is a configuration change with no testing required.
Dependabot will simply stop creating PRs for npm dependency updates in
the docs folder.

https://claude.ai/code/session_01VsowarouQCAGyQo7aSq7s1

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Co-authored-by: Claude <noreply@anthropic.com>

Author: theosanderson

.github/dependabot.yml

@@ -33,15 +33,6 @@ updates:
       patch:
         update-types:
           - "patch"
-  - package-ecosystem: npm
-    directory: docs/
-    schedule:
-      interval: weekly
-    groups:
-      minorAndPatch:
-        update-types:
-          - "minor"
-          - "patch"
   - package-ecosystem: gradle
     directory: backend/
     schedule: