dont use pointer in loader

[Haaroon]

What changes were proposed in this pull request?

Why are the changes needed?

Does this PR introduce any user-facing change? If yes is this documented?

How was this patch tested?

Are there any further changes required?

[codecov]

Codecov Report

Merging #164 (df08664) into main (9d8db8d) will increase coverage by 0.74%.
The diff coverage is 97.43%.

❗ Current head df08664 differs from pull request most recent head 902eb50. Consider uploading reports for the commit 902eb50 to get more accurate results

@@            Coverage Diff             @@
##             main     #164      +/-   ##
==========================================
+ Coverage   70.13%   70.87%   +0.74%     
==========================================
  Files          68       67       -1     
  Lines       10517    10538      +21     
==========================================
+ Hits         7376     7469      +93     
+ Misses       3141     3069      -72     

Impacted Files	Coverage Δ
docbrown/src/core/mod.rs	95.23% <ø> (+52.38%)	⬆️
python/src/graph_loader.rs	0.00% <ø> (ø)
docbrown/src/graph_loader/reddit_hyperlinks.rs	92.18% <93.33%> (+92.18%)	⬆️
docbrown/src/db/graph.rs	89.52% <100.00%> (+0.18%)	⬆️
docbrown/src/graph_loader/lotr_graph.rs	77.77% <100.00%> (ø)
docbrown/src/graph_loader/mod.rs	95.00% <100.00%> (+1.25%)	⬆️

... and 1 file with indirect coverage changes

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