Feature/us20/entry form image upload

[dimitriosxmi]

Please take a moment to review this ❤️ 😊

Its not +380 line changes but +250 instead because of package-lock.json installs

Goal: US20 TL; DR: Add image file selection and uploading for entries, and adapt the styling in the Entry preview card and the Entry details component in the entry view page.

Deployment

! Update EntryDetails component
# Adapt styling to new image uploading.

! Update EntryForm component
# Add Image selection and deselection buttons.
# Add Image uploading to cloudinary.

! Update EntryPreview component
# Same as EntryDetails component, aka:
# adapt styling to new image uploading.

! Update next.config.js
# Add a remote hostname to trust and use
# for the image fetching through a url.

! package-lock.json AND package.json
# Install cloudinary which I didn't end up using..
# because of the time sensitive status.

PS: The only thing worth reviewing is the EntryForm component

[Danielschuetzle]

lgtm, nice implementation of the img upload and cloudinary