add nav header

[lansami]

Please always provide the GitHub issue(s) your PR is for, as well as test URLs where your change can be observed (before and after):

Fix #24

Test URLs:

• Before: https://main--helix-website-wc--adobe-gw2023-project-bricks.hlx.page/home
• After: https://header-styling--helix-website-wc--adobe-gw2023-project-bricks.hlx.page/home

[aem-code-sync[bot]]

Hello, I'm the AEM Code Sync Bot and I will run some test suites that validate the page speed. In case there are problems, just click the checkbox below to rerun the respective action.

• [ ] Re-run PSI Checks

[aem-code-sync[bot]]

Page	Scores	Audits	Google
/home