Addressing issue 97: hide sign in from navbar and add blank about page

[TwentyPorts]

97

[netlify[bot]]

:construction_worker: Deploy preview for reentry processing.

:hammer: Explore the source changes: 70f38a31417c75899bf9e89bfdd83c0394bc560c

:mag: Inspect the deploy logs: https://app.netlify.com/sites/reentry/deploys/5fd064f9a85c7a00074c9cb1