Fixed Node::append_child, Node::append_children, Node::prepend_child, and Node::prepend_children

[niklak]

• Fixed Node::append_child, Node::append_children, Node::prepend_child, and Node::prepend_children: these methods now internally remove the child/children from their previous parent node before attachment.

It was very easy to forget to call child.remove_from_parent().

[codecov]

Codecov Report

Attention: Patch coverage is 95.65217% with 2 lines in your changes missing coverage. Please review.

Project coverage is 83.20%. Comparing base (45b44fc) to head (ab576e4).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
src/dom_tree.rs	94.44%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
+ Coverage   83.13%   83.20%   +0.07%     
==========================================
  Files          13       13              
  Lines        1986     1989       +3     
==========================================
+ Hits         1651     1655       +4     
+ Misses        335      334       -1     

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