Swallowing Up Linux (With Windows)

It hurts to have to pick windows over Linux, but I just couldn't maintain the lack of disk space the partition caused. Unfortunately, the sheer amount of bloatware from windows took up roughly 90% of the allocated space, which was a little over 60GB - if I remember correctly.
I would love to have scrapped the windows partition instead, but I unfortunately need it for the better touch integration (for design related projects). This has been a long time coming, I've been barely managing to keep enough disk space to work on this year's MSDG merch designs, and now I've adopted the challenge of designing 3D printing models. I couldn't justify putting it off any more, so I committed the crime of letting the windows partition on my 'very-serious-working-gal' laptop swallow my Linux partition.

The first part of this was pretty simple:
I installed a free partition manager on the windows partition, then used that to wipe the content of the Linux partition so it was free unallocated space.
Then I extended the windows partition to include all of that unallocated space, applied the changes and rebooted.

...

Which is when I ran into a problem.

I had forgotten to change my boot settings to prioritise Windows and get rid of GRUB (Grand Unified Bootloader). Naturally, my laptop tried desperately to load GRUB and panicked when it couldn't find the files for it (having been deleted with the rest of my Linux partition).
Which is when it presented me with this in the top left corner of my screen:

This is the GRUB Rescue terminal, the only thing stopping my laptop from being completely bricked.

From there I couldn't access anything. I couldn't even manually shutdown my laptop because my power button was being difficult (my laptops not as sparkly new as it used to be), and I couldn't tell it to boot into the Windows partition because it didn't recognise the file system.

My first attempt to fix the issue was to quickly flash a USB with a different Linux bootloader and tell GRUB Rescue to boot from that.
Unfortunately, despite having recognised this same USB earlier in the day, it decided it could no longer see it. So that plan got scrapped pretty quickly - there's not much I could do to fix that.
But that was okay, because at this point my power button decided to work again. I manually shut my laptop down and got ready to reboot it. As I was rebooting it, instead of letting it go back to the same - fairly useless - screen, I held the power button and lower volume buttons down. This manual shortcut sent me to the UEFI firmware settings, which is exactly where I needed to be to change the boot settings to prioritise Windows, and delete GRUB from the options.

I then told my laptop to boot and, after half a day of suffering, my laptop successfully boots back into Windows.