Use https for resources and documentation.

[gravitystorm]

I noticed today on openstreetmap.org that some chapter links were not using https, so I made some investigations. This PR updates all of the resources and documentation that used http to use https, where:

• The http version redirects to https (checked with curl -I, received a 301 or 302 response) - that was most of them, or
• The http version doesn't redirect, but serves the same content as the https version ( https://www.uwyo.edu/geography/geographyclub/ and https://bit.ly/SlackOsmUa )

There were two resources that I didn't update, since they need further investigation:

• resources/africa/nigeria/ym-Federal-University-of-Technology-Akure.json:9: "url": "http://spaceclubfuta.com.ng/" - domain not found
• resources/asia/bangladesh/ym-Asian-University-for-Women.json:9: "url": "http://www.auw.edu.bd/" - no redirect, but some kind of in-browser redirect to a completely different domain.

These two could be addressed separately.

In addition, there is some json-schema-related files that I haven't changed either, they could again be addressed separately.

Refs #533

[kmpoppe]

Just shy of a month later, three of the sites that you changed do no yield any meaningful information anymore:

resources/africa/guinea/ym-General-Lansana-Conte-University.json
resources/africa/south_africa/ym-University-of-Pretoria.json
resources/north-america/united_states/ym-University-of-Oregon.json

All pages have a "contact" person, do you want to send mails to them @gravitystorm Andy? I will merge your changes anyway, there's no use in waiting for any kind of response from them. More changes can be worked on with a new PR.

[gravitystorm]

@kmpoppe - thank you for merging! I don't have any plans to follow up on the sites that aren't responsive, I was just focussed on the http/https related changes for our downstream usage.

[kmpoppe]

Okay thanks. Btw, @gravitystorm, do you have a script at hand that could check all URLs for 4xx/5xx responses?