Added AppImage folder and Install Software with AppImage document for Desktop category

[j0eybrinkman]

Author checklist (Completed by original Author)

• Good fit for the Rocky Linux project? Title and Author Metatags inserted ?
• If applicable, steps and instructions have been tested to work
• Initial self-review to fix basic typos and grammar completed

Rocky Documentation checklist (Completed by Rocky team)

• 1st Pass (Document is good fit for project and author checklist completed)
• 2nd Pass (Technical Review - check for technical correctness)
• 3rd Pass (Detailed Editorial Review and Peer Review)
• Final approval (Final Review)

[github-actions]

Test results for 4d37530:

Number of broken URLs: 1

URL,RESULT,FILENAME
 https://azuremarketplace.microsoft.com/en-us/marketplace/apps/resf.rockylinux-aarch64,failed,guides/cloud/migration-to-new-azure-images.md

[sspencerwire]

Thank you @j0eybrinkman! Is there a chance that in the future you can use either .jpg or .png image types? While .webp works, reviewing the images in GitHub isn't possible as GitHub sees them only as:

Binary file not shown. 

[j0eybrinkman]

yes i can use jpg and png images