Add linter branding for docs

[ssbarnea]

• Add linter logo and favicon that renders ok with light/dark themes
• Corrects documentation title

[ssbarnea]

Note to reviewers, client the docs job and look at browser favicon, you should see a gray shield with Ansible "A" on top of it, a design that works with both day/night themes.

[webknjaz]

@ssbarnea why isn't logo_invert.png SVG? I'd like to avoid adding bitmap images and only keep the vector ones...

[ssbarnea]

@ssbarnea why isn't logo_invert.png SVG?

Because filename is hardcoded in the theme. We can look into making it configurable in the future.

[webknjaz]

@ssbarnea why isn't logo_invert.png SVG?

Because filename is hardcoded in the theme. We can look into making it configurable in the future.

Then, I'd postpone it until we do so. Adding+removing binaries from Git make the repo bigger unnecessarily.

[ssbarnea]

@ssbarnea why isn't logo_invert.png SVG?

Because filename is hardcoded in the theme. We can look into making it configurable in the future.

Then, I'd postpone it until we do so. Adding+removing binaries from Git make the repo bigger unnecessarily.

We are talking about a 5kb image, not 5mb one. It is smaller than most of our source codes. If would have being >200kb it would have made sense.

[acozine]

This is an improvement, thanks @ssbarnea.