Use HTTPS for external links when possible (round 2)

[muzimuzhi]

Similar to my previous issue #26 created and resolved almost three years ago, this issue mainly focus on Part 2 and the site for book Real World Haskell.

To be updated to HTTPS (filtered by grep -rn --exclude-dir=img 'http:' .)

• several http://book.realworldhaskell.org in both part1.html and part2.html
• https://httpbin.org/base64/aGFza2VsbCBmb3IgZXZlcgo= in part2.html and exercises/Examples/FetchWords.hs
• three occurrences of http://hackage.haskell.org/package/warp-3.3.14 in part2.html
• http://oleg.fi/gists/posts/2017-04-18-glassery.html in part2.html
• three occurrences of http://creativecommonse.org/licenses/by-sa/4.0/ in LICENSE and README.md

I didn't take the Part 2, hence don't know if localhost URLs in part2.html and its exercises support HTTPS or not.

Remaining HTTP-only site

• http://learnyouahaskell.com

[opqdonut]

Thanks! Will be fixed soon.

[muzimuzhi]

Three remaining HTTP found in interactive stack ghci:

./part1.html:294:GHCi, version 9.2.8: http://www.haskell.org/ghc/  :? for help
./part1.html:892:GHCi, version 9.2.8: http://www.haskell.org/ghc/  :? for help
./part1.html:1123:GHCi, version 9.2.8: http://www.haskell.org/ghc/  :? for help

I don't have access to stack right now but according to https://downloads.haskell.org/ghc/latest/docs/users_guide/ghci.html#introduction-to-ghci HTTPS is already used for GHCi v8.y.z.

[opqdonut]

Thanks for your attention to detail!