Add images to RF waveguide tutorial

[duarte-jfs]

Added images to the gitignore file

[HelgeGehring]

You don't need to add them to the gitignore, once something is added (you can still add ignored files just with git add) it'll keep being tracked :)
About the images, can we just post pictures of papers? Don't know if that's allowed 🤔

[simbilod]

You don't need to add them to the gitignore, once something is added (you can still add ignored files just with git add) it'll keep being tracked :) About the images, can we just post pictures of papers? Don't know if that's allowed 🤔

Typically there are links in articles to ask to reproduce figures. Depending on the journal and where you want to reuse the material, it may be free or cost something.

[duarte-jfs]

Apologies. I will close this pull request and create new ones, one for each topic.

EDIT: Reverted the commit on the meshing.

[HelgeGehring]

Thanks for the new PR!

How do we go on with this? Should we do our own pictures? Or does the journal have clear rules on reproducing pictures?

[duarte-jfs]

I say we just remove the figure and don't take any chances. It's not crucial to have the figure, and later we compare with data extracted from the paper

[HelgeGehring]

Looks good! The four remaining pictures you made yourself?

Did you by chance make them using some vector graphic tool (e.g. inkscape) and could upload them as a svg file? That way the pictures would be adjustable just like the rest of the docs (and the files also smaller :) )