Bump cssnano from 6.1.2 to 7.0.1 in /wwwsrc

Bumps [cssnano](https://github.com/cssnano/cssnano) from 6.1.2 to 7.0.1.
- [Release notes](https://github.com/cssnano/cssnano/releases)
- [Commits](https://github.com/cssnano/cssnano/compare/cssnano@6.1.2...cssnano@7.0.1)

---
updated-dependencies:
- dependency-name: cssnano
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

wwwsrc/package.json

@@ -7,7 +7,7 @@
     "bootstrap": "^5.3.1",
     "chart.js": "^4.2.0",
     "couch64": "^1.0.2",
-    "cssnano": "^6.0.0",
+    "cssnano": "^7.0.1",
     "cssnano-preset-advanced": "^6.0.0",
     "postcss-cli": "^11.0.0",
     "purgecss": "^5.0.0",