Improvements to "the hard way" install instructions

[michielbdejong]

Quoting @momerath42 from Slack:

for fixing the docs, the main stumbling blocks I ran into were:

1. latest node version (via nvm)
2. sudo pm2 logrotate command doesn't work, because root doesn't have pm2/node in its path - running without sudo outputs a command that will work (but which isn't universal enough to just paste into the instructions I think)
3. yarn install --production didn't install all the dependencies; npm i worked
4. after configuring nginx proxying, certbot won't work

[michielbdejong]

we should also mention in the install instructions that running ilp-kit on heroku is not so useful for debugging, because you can't ssh into a heroku dyno and live-edit the code. Azure gives you 170 USD free at signup, and it's pretty much a five minute process (very similar to the heroku one) so Azure is a good default option.

[michielbdejong]

Another point brought up by @peterjkrey: there is a stray backtick after 'nginx' in https://github.com/interledgerjs/ilp-kit/blob/master/docs/SETUP.md#set-up-proxy-for-ilp-kit

[michielbdejong]

we should also move the GCE instructions down (maybe a separate 'hard way' section for GCE and digital ocean), and move Azure and Heroku up (even above docker-compose). So I would say:

easy

1. Azure
2. Docker-compose
3. Heroku

hard

4. Ubuntu
5. GCE

[ghost]

I would say we could consider remapping 'Easy' -> 'Recommended', 'Hard' -> 'Under Development' just so its clearer to the user that the 2nd group may break.

[michielbdejong]

It will not break of its own accord, whether or not it works depends on how successfully you set everything up.