Increase the li::marker color contrast in the theme blog's dark mode

[87xie]

What

In the dark mode of the blog theme, the list item marker color still references the variables from the light mode, resulting in a lack of color contrast for the ordered list item markers.

I can create another pull request for the v3 branch if needed.

How

Referencing the current styles in the doc theme, apply the basic text color to the list item color in the blog theme.

Before

.nx-prose :where(ol>li):not(:where([class~=nx-not-prose] *))::marker {
    color: var(--tw-prose-counters); /* #6b7280 */
    font-weight: 400;
}

.nx-prose :where(ul>li):not(:where([class~=nx-not-prose] *))::marker {
    color: var(--tw-prose-bullets); /* #d1d5db */
}

After

:is(html[class~=dark] .dark\:nx-prose-dark) :where(li):not(:where([class~=nx-not-prose] *))::marker {
    color: #d1d5db;
}

[changeset-bot]

🦋 Changeset detected

Latest commit: ccf8418

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
nextra-theme-blog	Patch
nextra	Patch
nextra-theme-docs	Patch

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