[js] fetch images from nasa api

[wisnie]

• generate nasa api key,
• use fetch to fetch APOD from today, yesterday and the day before yesterday,
• display images on top of the page and keep the aspect ratio specified on designs

[wisnie]

resources:

• https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch,
• https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelector,
• https://developer.mozilla.org/en-US/docs/Web/API/HTMLImageElement/src,
• https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/ARIA_Live_Regions