add spinner and sidebar toggle

[d-rk]

Hi

I hope you don't mind another PR from me 😰

This PR introduces the following:

• the sidebar is hidden by default (needed for the spinner)
• while search for an engine is running a spinner is shown
• a click on the sidebar first focuses the engine results. a second click collapses the engine results and a third one expands them again
• links in search results are opened on a new page

[d-rk]

the onToggle method here is the same like below in <Results. this needs to be refactored, but I gonna need help for this.

[artnc]

Could you please post some screenshots? I'm having trouble getting the spinner to appear 🤔

Also I'd prefer to follow standard UI patterns (seen in other search websites like Google) by letting the user decide whether they want to open result links in new tabs (e.g. via middle click or ctrl+click) rather than deciding for them

[d-rk]

Could you please post some screenshots? I'm having trouble getting the spinner to appear 🤔

I tested it again in Firefox and Chrome. Works on my machine :)

Also I'd prefer to follow standard UI patterns (seen in other search websites like Google) by letting the user decide whether they want to open result links in new tabs (e.g. via middle click or ctrl+click) rather than deciding for them

Thats a valid point. I reverted the changed link open behavior