Resize & lower the weight of all images for mobile & slower connections

[Pierstoval]

I used this command to do the resize:

$ magick 'image path' -resize x1000 -quality 100 'output path'

For concerned images, that's quite a gain! And the loss is barely perceptible on my 27'' screen.

Image	Initial size	New size	Gain
Webb Deep Field Cropped.png	12 524 KB	1 346 KB	-89,25 %
Hubble Cropped.png	8 827 KB	1 554 KB	-82,39 %
Southern_nebula_webb.png	21 813 KB	1 219 KB	-94,41 %
Southern_ring_nebula_Hubble_Rotated.png	2 848 KB	293 KB	-89,71 %
Stephans_Quintent_Webb.jpg	5 054 KB	1 006 KB	-80,09 %
Stephan's_Quintet_Hubble_Rotated.jpg	584 KB	382 KB	-34,59 %
TOTAL	51 650 KB	5 800 KB	-88,77 %

Feel free to close or make other suggestions 👍

(some changes are caused by my IDE automatically removing trailing spaces)

[Pierstoval]

Closing in favor of #4 which has a way more responsive proposal