Added section of snap to common angles

[SeqLaz]

Added snap to common angle documentation.

https://github.com/opengisch/QField/pull/4805

[duke-nyuki]

Task linked: QF-4046 #4805 Snap to common angle

[nirvn]

@SeqLaz , you are on :fire: ;)

One comment that's valid for all the of the PRs you have opened yesterday: please refrain from using GIFs as videos. A better format in 2024 is webm, which delivers a much better compression factor, and aren't limited to 255 colors.

E.g., this (quite large) snapping GIF here goes from a 51.3mb GIF to a 12.3mb webm:

Behind these PRs, I think we should explore using an actual video format such as mp4 to allow for people to have controlled playback of the videos. But that's for tomorrow.

[SeqLaz]

Hey @nirvn, thank you for your reviews.

Look at the last commit, what do you think about that format (the video with the frame and the size of the video, is small, I think)

[nirvn]

@SeqLaz , going from +40mb to 4mb is most welcome:)