Just as discussed in #1513 , this pull request adds support for
[jsonresume](https://jsonresume.org/). Create the resume once, either as
a file in the repository or at [github gist](https://gist.github.com/)
called `resume.json`. Put the file in the `_config.yaml` file and that's
it! Other platforms like [resumake](https://latexresu.me/) use the same
schema.
I also incorperated the changes introduced by #1339 to the best of my
abilites. The style could be further improved.
**Please merge this pull request after #1339 is merged, due to
dependencies from it**
If someone has a bettet approach on how to solve the problem that each
section needs its own template, please let me know. But for now it works
fine and is still backwards compatible with the `cv.yaml` file.
Co-authored-by: George <31376482+george-gca@users.noreply.github.com>
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