feat: add new logo & mascots

[dgarcia360]

Closes #1181

How to test

Build the docs and see the new logo.

To check the available mascots, open: http://127.0.0.1:5500/examples/mascots/

Next steps

Once we release a new version of the theme, we will need to manually change the mascots in the following projects:

• https://docs.scylladb.com/stable/
• https://iot.scylladb.com/
• https://feature-store.scylladb.com/stable/
• https://cloud.docs.scylladb.com/stable/
• https://gaming-leaderboard.scylladb.com/stable/

[dgarcia360]

@annastuchlik @kwiato I couldn't find the following mascots updated, please advice what to use instead:

[annastuchlik]

The preview looks great. @kwiato Could you provide the missing mascots/logo versions?

[kwiato]

Added two mascots myself. Asked Julia for the other 3, I'll update them as soon as I get them.

[dgarcia360]

Thanks @kwiato! Added the two new mascots:

[dgarcia360]

We are missing:

• docs
• manager
• carepet

[kwiato]

@dgarcia360 Added new mascots to figma

[dgarcia360]

Thanks @kwiato

@annastuchlik New mascots added, ready for review.