Fixing colors not using theme colors and renaming some css variables

[jovica-me]

Hello,

We previously discussed about colors and the design system is in the theme. I didn't want to make a pull request with big changes so this pull request is only focuses on using the exiting token and fully utilizing them in the code. You can see changes to each specific token in the commits.

Some of the changes:

• Renaming some tokens.
• Removing unnecessary classes.
• Removing tertiary button the unused button one and renaming secondary to outline because it was never using the secondary color.
• Removing secondary token. It was never used.
• Cleaning up some code with unnecessary classes.

There are some places where I didn't make any changes like Pricing.astro because they can require marking new tokens outside the exiting ones.

[prototypa]

Hi @jovica-me

We are working on a new definition of tokens.

We prefer not to mix this PR for now (lots of changes) until we study well the needs and variants we have to achieve greater flexibility in a clean way.

Thanks