Add Gitpod config, Update node version, Update some dependencies, Reduce logo size and Add github actions

[chintan9]

Add Gitpod config, Update node version, Update some dependencies, Reduce logo size and Add github actions

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This change is 

[au5ton]

boop @asapach

[asapach]

What's Gitpod and why should it be so prominently mentioned on the home page? I'm afraid that out of the 58 commits in this PR only a couple would make sense

[pataquets]

Skimming the commit log, I see some worthwhile changes, mainly dependencies upgrading.
For the Gitpod concern, I've checked it and I think it won't hurt to have the button available, IMHO. It would ease contributing, which is always good. However, I agree on the fact that's too prominently placed, with no reason. Maybe placing it somewhere else, such as in the development markdown file would be a better place and would make more sense.
@asapach If it makes sense to you, maybe @chintan9 can push a commit moving it. I checked out the Github 'network graph' and @chintan9 's fork has lots of commits which surely would be worthwhile to consider. What do you think?

[asapach]

Most of these changes are low hanging fruit, and can now be mostly automated using GitHub bots, so this PR of little value. However if somebody wants to create a new PR with a cleaner history, without bells and whistles, they are welcome.

[pataquets]

Are the changes good enough as they are? I mean, would just a squash be enough?
I could give a stab at it, if they are. Unless @chintan9 beats me at it :) I would like the credit going to the OP.

[asapach]

You could cherry-pick the changes to package.json (+ package-lock.json) and .travis.yml, the rest are irrelevant.