[Feature request] Add a "Search" / "Go" button to the default frontend

[jpodolski]

• Is your feature request related to a problem? Please describe.
  I will occasionally use Invidious on a flip phone that can only navigate the web with "mouse" inputs, and by typing into text fields; there is no "return" or "enter" key when interacting with a page. This means I can type into the searchbar, but I cannot submit my query.

• Describe the solution you'd like
  Altering the GUI to include a "go" or "search" button next to the search input field that submits the search query when pressed.

• Describe alternatives you've considered
  Currently, I search on youtube.com to load a video, then replace the FQDN in my address bar with that of my preferred instance. I will try to submit this change myself if I have time since it is a simple, small request that mostly benefits me.

Thank you developers for all your hard work--I have donated to the project and I hope to try running my own instance soon.

[ChunkyProgrammer]

I think this will be fixed when #4706 gets merged

[syeopite]

Duplicate of #529