feat: serve rendered pages over http, spartan and nex

content/.itsybitsy.toml

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+[defaults]
+cache_control = 60
+
+[page."about.md"]
+title = "About itsybitsy"

content/about.md

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+# About
+
+One folder of Markdown, rendered on request into every format a listener serves.
+
+<!-- card Rendering -->
+
+Parsed once per document, not once per format.
+
+<!-- card Configuration -->
+
+A `.itsybitsy.toml` per directory, with no inheritance.

content/index.md

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+# itsybitsy
+
+A small daemon serving this folder over HTTP, [Spartan](/about) and Nex.
+
+- North Loop: open
+- South Loop: closed
+
+| Format | Port |
+| --- | --- |
+| HTTP | 8080 |
+| Spartan | 3000 |
+| Nex | 1900 |
+
+See the [about page](/about) for more.