Fix generated license html code metadata

[obulat]

Fixes

Fixes #180 by @obulat

Description

The PR reworks the creation of license html code to fix metadata and links, adding rel=license to fix #180.

Screenshots

This is the code that is created now:

<p xmlns:dct="http://purl.org/dc/terms/" xmlns:cc="http://creativecommons.org/ns#" class="license-text"><a rel="cc:attributionURL" property="dct:title" href="obulat.com/picture.jpg">My Picture</a> by <a rel="cc:attributionURL dct:creator" property="cc:attributionName" href="obulat.com">Olga Bulat</a> is licensed under <a rel="license" href="https://creativecommons.org/licenses/by-nd/4.0">CC BY-ND 4.0<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/cc.svg?ref=chooser-v1" /><img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/by.svg?ref=chooser-v1" /><img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/nd.svg?ref=chooser-v1" /></a></p>

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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