docs: fix links in readme

[besaleli]

These were not pointing to anything since the building guide is in the docs. I've linked it directly to our deployed docs.

[codspeed-hq]

CodSpeed Performance Report

Merging #132 will not alter performance

_{Comparing docs/fix-links (0e0052d) with main (26d0e33)}

Summary

✅ 20 untouched
⏩ 20 skipped¹

Footnotes

1. 20 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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