HTMLGenerator component tests

[obulat]

Fixes #36

Description

Unit and e2e tests for HTMLGenerator component.

Other information

The tests cover filling in 4 out of 6 fields in the form. I couldn't find what filling in Source Work URL and More Permission URL fields change in html or rich text.

Checklist:

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the master branch of the repository.
• My commit messages follow best practices.
• 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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[akmadian]

Please move the e2e spec to ./test/e2e/specs/components/, and if you would like to remove the Source Work URL and More Permission URL fields from ./src/components/HTMLGenerator.vue, that would also be nice :)

[obulat]

I've moved the test files and removed two fields from the HTMLGenerator component.

[akmadian]

Thanks, @obulat!