add guided tour for gcsim web

[k0l11]

It might be easier to onboard people if the website offered a guided tour (with translations) that explains everything

• explain everything that is on simulator page
• write first config to explain basic gcsl
• run first config
• explain the stuff shown on viewer page
• show + explain the different tabs on viewer page
• ...

Could also split it into multiple tours. Could use something like https://react-joyride.com/.

[unleashurgeek]

Might want to bundle a "template/example config" that is annotated with explanations to show to new viewers and as part of the guided tour