chore: update config files, icons and readme

- Update FUNDING.yml formatting
- Remove debug log in sanitize-pdf.ts
- Adjust test expectation for tool count
- Standardize dependabot.yml quotes
- Update tool icons in config
- Expand and reorganize README features list
- Fix markdown formatting in README

src/tests/pdf-tools.test.ts

@@ -19,7 +19,7 @@ describe('Tool Configuration Arrays', () => {
 
     it('should have the correct number of tools', () => {
       // This acts as a snapshot test to catch unexpected additions/removals.
-      expect(singlePdfLoadTools).toHaveLength(39);
+      expect(singlePdfLoadTools).toHaveLength(40);
     });
 
     it('should not contain any duplicate tools', () => {