Remove rotation-related functions

[hyrodium]

This PR removes rotation-related functions. (closes #86) ~Note that the documentation is failing to build because Rotations.jl assumes Quaternion has the norm field. I'd like to wait for https://github.com/JuliaGeometry/Rotations.jl/pull/243.~

Edit: The documentation does not depend on Rotations.jl now.

[codecov[bot]]

Codecov Report

Merging #111 (b7aa354) into main (9c62d64) will increase coverage by 0.76%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #111      +/-   ##
==========================================
+ Coverage   98.44%   99.20%   +0.76%     
==========================================
  Files           1        1              
  Lines         193      126      -67     
==========================================
- Hits          190      125      -65     
+ Misses          3        1       -2     

Impacted Files	Coverage Δ
src/Quaternion.jl	99.20% <ø> (+0.76%)	:arrow_up:

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[hyrodium]

@sethaxen Thank you for the corrections, and sorry for my poor English:sweat_smile:. I think we can improve the documentation after the release of v0.7.0 if there are no major problems in this PR.

[sethaxen]

I think we can improve the documentation after the release of v0.7.0 if there are no major problems in this PR.

You're right, no problem at all! LGTM.