Added GraphCast blog

[pling-scottlogic]

https://pling-scottlogic.github.io/blog/2024/03/06/Something-in-the-Wind-Weather-Forecasting-in-the-Age-of-AI.html

Have you (please tick each box to show completion):

• Added your blog post to a single category?
• Added a brief summary for your post? Summaries should be roughly two sentences in length and give potential readers a good idea of the contents of your post.
• Checked that the build passes?
• Checked your spelling (you can use npm spellcheck if that's your thing)
• Ensured that your author profile contains a profile image, and a brief description of yourself? (make it more interesting than just your job title!)
• Optimised any images in your post? They should be less than 100KBytes as a general guide.

Posts are approved based on their category. replace (at) with @ to notify them!

• Tech - Colin Eberhardt - @ColinEberhardt
• Cloud - Colin Eberhardt - (at)ColinEberhardt
• Delivery - Matt Phillips - (at)scottlogicmphillips
• UX - Graham Odds - (at)godds
• People - Graham Odds - (at)godds
• Testing - Laurence Pisani - (at)lpisani-SL

[afroggattsl]

this has been reviewed (including by Marketing) so I am merging it in at Oli Cron's request