Update the logo and color

[jaipurandare]

On the website - use the logo without a date that Hana created - here is the link in Google Drive: https://drive.google.com/file/d/124EOI9Zhl79c-eti4jsg_fOV2iIDHQV1/view?usp=drive_link

Also - please update the yellow color in the header to match the "Secondary Yellow" color in our PyBAy Brand identity doc
https://docs.google.com/document/d/14ieViGP43E7KTqkVzN4c2QUUgZXMJiTZJpqeAibUL58/edit?tab=t.0#heading=h.z3h87ny1z2b

[surfaceowl]

Closed by PR #51