The file bareos-logo.png does not seem to be used at all. In my test install, I deleted these files without any noticable effect:

    deleted:    public/img/bareos-logo.png
    deleted:    public/themes/default/img/bareos-logo.png
    deleted:    public/themes/slate/img/bareos-logo.png
    deleted:    public/themes/sunflower/img/bareos-logo.png

So it is likely that these files can be removed entirely.

The other redundant PNG files and font files are probably unavoidable without much more changes in the PHP code and in the bootstrap CSS.

I'd really like to avoid removing original source image material from source tree even if it's not actively used in the application currently.

If a theme doesn't and probably never will use the mentioned one above, we could remove it, I agree.

But let's keep and not touch originals in the default image folder (public/img/).

Our README.md for example references an image located in here as well,
another reason I kept the folder and images for now.

If we want to reduce application size, build and packaging should handle this.

We could move the img folder one directory up to place it in webui root folder and have the source image material available there, I guess. That might already exclude it from being packaged, but I have to check that out.

In addition this change would require to adjust the image reference in our https://github.com/bareos/bareos/blob/master/README.md .

Removed unused image material from themes except one source image for reference in the default theme folder I'd like to keep for now.

Also adjusted the Bareos logo include in our README.md in a separate commit due to the recent changes.

Note: This PR requires #1313 to be merged first. Afterwards we need to rebase this one.

Removed the experimental slate theme and reduced the left themes to its minimum.

Updated PR title and description.

CHANGELOG.md needs to be adjusted.

We should also squash commits before merge for a clean commit history. I kept it due to the review process for now as it is.

It might be good idea, to refer to the source of the sunflower picture, at least in the git commit message.