Include path in test if URL exists

[kordwarshuis]

• What: Include path in test if URL exists
• Why: Currently terms_dir is not included in the test if URL exists
• Who: @kordwarshuis
• What way: add path to URL before passing to function that tests, use the GitHub URL structure
• Where: https://github.com/trustoverip/spec-up-t/blob/master/src/utils/doesUrlExist.js

Example:

        {
          "url": "https://github.com/trustoverip/ctwg-main-glossary",
          "gh_page": "https://glossary.trustoverip.org/",
          "terms_dir": "spec/terms-definitions",
          "external_spec": "ctwg"
        }

Currently this is tested:
https://github.com/trustoverip/ctwg-main-glossary

Instead the whole path,
https://github.com/trustoverip/ctwg-main-glossary + spec/terms-definitions should be tested, which would become this URL:

https://github.com/trustoverip/ctwg-main-glossary/tree/main/spec/terms-definitions

Note this part: /tree/main/

[kordwarshuis]

Also "gh_page" should be tested.