Bump docs-resources from 51d3e82 to a76dd1d (#477)

Bumps [docs-resources](https://github.com/riscv/docs-resources) from
`51d3e82` to `a76dd1d`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/riscv/docs-resources/commit/a76dd1d390cba28e3b1ce86313af03ce9b69399d"><code>a76dd1d</code></a>
Merge pull request <a
href="https://redirect.github.com/riscv/docs-resources/issues/40">#40</a>
from riscv/39-fix-base_font_size_min-properly</li>
<li><a
href="https://github.com/riscv/docs-resources/commit/716559620e0f049703b7052a0fd31e757e936c0f"><code>7165596</code></a>
Fixed font_size_min.</li>
<li><a
href="https://github.com/riscv/docs-resources/commit/f1afa6f75e94def6479c3cd60cb720fb7a6e6021"><code>f1afa6f</code></a>
Merge pull request <a
href="https://redirect.github.com/riscv/docs-resources/issues/38">#38</a>
from riscv/revert-37-36-base_font_size_min-requires-a-...</li>
<li><a
href="https://github.com/riscv/docs-resources/commit/88f63a7473283be409a47e4e6b7049b9018093fd"><code>88f63a7</code></a>
Revert &quot;Change font_size_min to 0.75&quot;</li>
<li><a
href="https://github.com/riscv/docs-resources/commit/1456c0dca19331c910f0d147db9b8caa2538aa04"><code>1456c0d</code></a>
Update fira_code.css</li>
<li><a
href="https://github.com/riscv/docs-resources/commit/6584c8570d0b3b234d1ff30c54e0047f0855379c"><code>6584c85</code></a>
Merge pull request <a
href="https://redirect.github.com/riscv/docs-resources/issues/37">#37</a>
from riscv/36-base_font_size_min-requires-a-number</li>
<li><a
href="https://github.com/riscv/docs-resources/commit/f531fa7498a4112c183b993be3b3b16e2db7a5f0"><code>f531fa7</code></a>
Change font_size_min to 0.75</li>
<li><a
href="https://github.com/riscv/docs-resources/commit/36fc02378d2d2426f3870cc3c330a1db0bee7554"><code>36fc023</code></a>
Merge pull request <a
href="https://redirect.github.com/riscv/docs-resources/issues/35">#35</a>
from edolnx/edolnx-fonts</li>
<li><a
href="https://github.com/riscv/docs-resources/commit/8c2b02806f92ff009bd27baede6453a960fe1d78"><code>8c2b028</code></a>
Add and use Atkinson Hyperlegible and Fira Code fonts</li>
<li><a
href="https://github.com/riscv/docs-resources/commit/07b9904bd4de7aca03257200a0f88cb2683d9790"><code>07b9904</code></a>
Merge pull request <a
href="https://redirect.github.com/riscv/docs-resources/issues/31">#31</a>
from riscv/30-all-heading-levels-have-same-font-size</li>
<li>Additional commits viewable in <a
href="https://github.com/riscv/docs-resources/compare/51d3e829231189bffc2cd12ba113d4810d562d19...a76dd1d390cba28e3b1ce86313af03ce9b69399d">compare
view</a></li>
</ul>
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