update Chiefs letter on Careers page

[lottiecoxon]

Turn this

Into this

Reasoning

• The colour blocks on the side are not in keeping with our branding and the hedgehog is sad and old.
• Also I like the idea of a page curl to make it look more realistic like they actually wrote this letter.
• I would also sway towards to real signatures but unsure if people will try and use them for fraud reasons ?

[lottiecoxon]

Hey @smallbrownbike - What is the best way to share this design with you for shipping?