Release ciigo v0.17.0 (2026-04-04)

**🌱 cmd/ciigo: add option to set base path and shutdown idle duration**

The `-base-path` option set the URL prefix for serving HTTP request.
This allow serving the content under the prefix other than "/".

The `-shutdown-idle` option set the duration when server will stop accepting
new connections and shutting down.
This option can be helpful to reduce the resources on local environment.

**🌼 all: make the anchor symbol position on the right side of headers**

Previously, when `:sectanchors:` is set, the default anchor symbol
position is absolute on the left side of heading text with block display
option (the symbol located outside of box area of headers).
In special case, this cause an overflow when the generated HTML are
rendered inside flex with fixed height (the body is scrollable with empty
content on bottom).

This module changes the anchor symbol position to the right side of
heading text to prevent scroll on such layout, without absolute position
and normal inline layout.
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