feat(ui): add instatus widget to the website footer (https://gitlab.com/postgres-ai/platform/-/issues/254)

Description

• Add Instatus widget to the Postgres.ai website

Related issue

https://gitlab.com/postgres-ai/platform/-/issues/254

Examples

Updated footer (added logo along with iframe widget with dark/light mode support):

Checklist

• the MR description has been reviewed
• this MR contains text changes and they have been reviewed OR there are no texts changes
• this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes
• this MR contains API changes and they have been reviewed OR there are no API changes