Add documentation for unjoined

documentation/NotoSansNKoUnjoined.article.html

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+<p>
+  Noto Sans NKo Unjoined is an unmodulated (“sans serif”) design for display texts in the African
+  <em>N’Ko</em> script.
+</p>
+<p>
+  Noto Sans NKo Unjoined contains 184 glyphs, 5 OpenType features, and supports 79
+  characters from 2 Unicode blocks: NKo, Arabic.
+</p>
+<h3>Supported writing systems</h3>
+<h4>N’Ko</h4>
+<p>
+  N’Ko (<span class="autonym">ߒߞߏ</span>) is an African alphabet, written
+  right-to-left. Used in West Africa for the Manding languages. Created in 1949
+  by Solomana Kante. The name of the script means “I say”. Has 19 consonants, 7
+  vowels and 8 diacritics. Influenced by the Arabic script. Read more on
+  <a href="https://scriptsource.org/scr/Nkoo">ScriptSource</a>,
+  <a href="https://www.unicode.org/versions/Unicode13.0.0/ch19.pdf#G18603"
+    >Unicode</a
+  >, <a href="https://en.wikipedia.org/wiki/ISO_15924:Nkoo">Wikipedia</a>,
+  <a href="https://en.wiktionary.org/wiki/Category:N%27Ko_script">Wiktionary</a
+  >, <a href="https://r12a.github.io/scripts/links?iso=Nkoo">r12a</a>.
+</p>

documentation/NotoSansNKoUnjoined.html

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+<p>
+  Noto is a global font collection for writing in all modern and ancient
+  languages. Noto Sans N’Ko Unjoined is an unmodulated (“sans serif”) design for display texts in
+  the African <em>N’Ko</em> script. It has 184 glyphs.
+</p>