You do not need to explicitly include the licence in the footer nor create a separate page for it. In the Material Icons Guide it says
We have made these icons available for you to incorporate them into your products under the Apache License Version 2.0. Feel free to remix and re-share these icons and documentation in your products. We'd love attribution in your app's about screen, but it's not required. The only thing we ask is that you not re-sell the icons themselves.
You are using the icons in a web app, so there is no installer or other redistributable package, where you would be required to include a file containing the notice.
Consider that in an Android or iOS application, where the app is downloaded and installed to the device, the icons can also be used but there is no way to include a separate notice... In those cases you would likely include the notice within the source code, perhaps in the main class, so that if the package were to be decomposed then the notice would be visible.
As it says, attribution in the about screen would be appreciated but not required.