Add a "Our APIs" menu which opens up a new API page

[Didier-Lalli]

API page is been designed by Chandan right now. It should have a few cards with:

• HPE GreenLake Cloud Service API portal on Redoc.ly
• HPE Redfish API portal on Redoc.ly
• a few other Fake API

[jaygiang]

@Didier-Lalli Here's a preview of the structure for Our APIs page https://deploy-preview-703--hpe-dev-portal.netlify.app/