update links styles

[akellbl4]

• move link style to global
• make hovers a bit darker on light theme and lighther on dark theme

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (b93fc48) 61.52% compared to head (13c2e4b) 61.52%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1687 +/- ## ======================================= Coverage 61.52% 61.52% ======================================= Files 133 133 Lines 3002 3002 Branches 715 715 ======================================= Hits 1847 1847 Misses 1151 1151 Partials 4 4 ```

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[github-actions[bot]]

size-limit report 📦

Path	Size
public/embed.mjs	2.03 KB (0%)
public/remark.mjs	73.09 KB (0%)
public/remark.css	8.24 KB (+0.12% 🔺)
public/last-comments.mjs	35.63 KB (0%)
public/last-comments.css	3.75 KB (+0.74% 🔺)
public/deleteme.mjs	12.06 KB (0%)
public/counter.mjs	749 B (0%)