Tidied up breadcrumbs file

[javabster]

fixes #114

In this PR:

• After discussion in one of our meetings we decided to remove the code button from the breadcrumbs (which is why most of the jinja logic in the file is now gone). This decision was made because qiskit projects already provide a link to the source code from the individual class/functions so it wasn't adding much value. There is an issue open (Help projects use sphinx.ext.linkcode so that source code links to GitHub #186 ) for further work on improving the source code links
• adjusted the CSS styling of the breadcrumbs box so the long text (3 lines or more) doesn't overflow the breadcrumbs box

before:

after:

[Eric-Arellano]

Thanks!

[Eric-Arellano]

What was this?

[javabster]

I believe this was a holdover from when the Tutorials were built using a separate process from the main package? Or it's possible it was just copied over from pytorch, because I don't remember seeing the theme_pytorch_project variable anywhere in our codebases.

[HuangJunye]

Thanks for cleaning up the breadcrumbs! While I like that the button got removed, I prefer the spacing above and below the breadcrumb before the change. Not sure if this is related to solving the issue of long breadcrumb you mentioned in the description. It would be great if we can solve that issue while still maintain the spacing.

Before

After