Prioritizing source_dir in sys.path

[peekxc]

This PR prioritizes the supplied source directory in the sys.path. Currently, the source directory of the Builder instance, when supplied, is appended sys.path:

def build(self, filter: str = "*"):
    ...
    if self.source_dir:
	import sys
        sys.path.append(self.source_dir)

I believe a better pattern should be:

def build(self, filter: str = "*"):
    ...
    if self.source_dir:
	import sys
        if sys.path[0] != self.source_dir:
            sys.path.insert(0, self.source_dir)

This prioritizes module imports from the given source directory first, as opposed to being at the end. For me, this fixes griffe-related resolution issues that arise from mixing relative imports with editable installs (#323).

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 80.75710% with 61 lines in your changes missing coverage. Please review.

Project coverage is 88.68%. Comparing base (ee4fa3c) to head (7923e8e).

Files with missing lines	Patch %	Lines
quartodoc/autosummary.py	80.75%	61 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #383      +/-   ##
==========================================
- Coverage   88.78%   88.68%   -0.10%     
==========================================
  Files          37       37              
  Lines        3004     2996       -8     
==========================================
- Hits         2667     2657      -10     
- Misses        337      339       +2     

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