Age of the Universe

[lonbar]

I've talked to @nikosarcevic this morning, who spoke with someone keen on using CosmΩracle. They suggested having the age of the Universe for a given set of default parameters as an output. I think it would be a cool addition, and isn't much work to implement.

[lonbar]

I've started a new branch with 8b58480. I have added the age of the Universe at the very top of the results.

I think we should move all the results into different sections. We can have a special section for distances, one for times (we can group the Universe age, age at redshift z and the lookback time at z in one group), and one or two groups more for other things. We can move the groups into columns (I'd say two in total) so that the page doesn't become overly long. @marcobonici @nikosarcevic what do you think?

[marcobonici]

This is a very difficult question 😅

Jokes apart, I like the idea to group together distances and make another group with times.
Additionally, I think that if we have the possibility to add a "show more plots" button (as is currently done) this should help in keeping the page as much clean as possible.