Feat/va badge updates

[aluarius]

Closes: #2769

Description

• new placement prop, that allows to set any badge position (old left and bottom props are still working until 1.6.0);
• new offset prop, that allows to amend badge position relatively to the main axis;
• related refactoring and minor bugfixing;
• docs updates;
• updates to the Vuestic site (somewhere was used a hack for what now offset prop does).

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any feature but make things better)

[rustem-nasyrov]

Nope, my branch was outdated.

[rustem-nasyrov]

Isn't would be better to control transparency by CSS variables?

[aluarius]

Imo not convenient for dynamic states.