docs(content): add languages & worldbuilding page content

Cover conlanging projects: Eittlandic (Old Norse-derived language
for fictional Nordic country), Proto-Ñyqy (proto-language of the
Ñyqy family), and Zikãti (conlanging experiment)

content/en/languages.md

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+---
+title: Languages & Worldbuilding
+description: Constructed languages (conlangs) and worldbuilding projects.
+---
+
+# Languages and Worldbuilding
+
+*Conlangs*, short for *constructed languages*, are artificial
+languages created by individuals rather than evolving naturally over
+time. They serve various purposes: international auxiliary languages
+like Esperanto, philosophical experiments like Lojban, fictional
+world-building like Tolkien's Elvish languages or Klingon, or simply
+artistic expression.
+
+I have been creating constructed languages and worlds, both for fun
+and for literary projects. My conlanging work is documented on my
+[dedicated conlanging website](https://conlang.phundrak.com/).
+
+## Eittlandic
+
+Eittlandic is the language of **Eittland**, a fictional Nordic
+country, born from the question: *what if there was another island
+like Iceland that never got Christianised?*
+
+The language derives from Old Norse and has been evolved
+naturalistically towards specific artistic goals. In Eittlandic, the
+country's name is pronounced /ɑɪʔlɑ̃d/.
+
+This project has been a personal artistic endeavour since 2018,
+focusing on worldbuilding and conlanging. More details are available
+on the [Eittland wiki](https://wiki.phundrak.com/s/eittland) and the
+[Eittlandic language
+documentation](https://conlang.phundrak.com/eittlandic).
+
+## Proto-Ñyqy
+
+Proto-Ñyqy is the proto-language and mother language of the Ñyqy
+language family tree. The documentation is written as an in-universe
+document would be, meaning all cultural and historical references are
+entirely fictional. The writing style draws inspiration from academic
+linguistic work, particularly Benjamin W. Fortson's *Indo-European
+Language and Culture*. The [Proto-Ñyqy
+documentation](https://conlang.phundrak.com/proto-nyqy) is publicly
+available online.
+
+## Zikãti
+
+Zikãti is another conlanging project currently in development. This
+one draws more from a conlanging experiment than a real worldbuilding
+project. [Its documentation](https://conlang.phundrak.com/zik%C3%A3ti)
+is also publicly available.