Make selector for element to wait for until rendering the page configurable

[emilic14]

Hello,
First of all thanks! your project is giving my nook a second life ^^.

My bug is related to your
await page.waitForSelector("home-assistant", { timeout: Math.max(config.renderingTimeout - navigateTimespan, 1000) });
Code, as I am personally not using lovelace but I am currently more of a Tileboard user... so this check is blocking.
Easy fix but just thought I would share it.

[sibbl]

That's great to hear!

Probably we could make the selector configurable as well, defaulting to the current value home-assistant.

Will add it to my list (or appreciate a PR) 👍