Replace '_' in paths in werc's docs section with '-', and set up apropriate redirects to avoid broken links.

sites/werc.cat-v.org/docs/web-server-setup/_header.md

@@ -0,0 +1,16 @@
+Setting Up Your HTTP Server to Run Werc
+=======================================
+
+
+Werc should work with any web server that supports the CGI interface, and a few
+that don't. Here are collected instructions and sample configurations for some
+of the most popular HTTP servers that people has used with werc.
+
+In general setup consists of mapping all paths for a virtual host to the
+werc.rc script, usually in practice this means that the `document root` (or
+similar concept) for a virtual host is mapped to
+`/path/to/werc/sites/domain.name.com/`, and if no static file matches the
+request, control is handed to werc.rc, this allows the HTTP server to handle
+static files and werc to handle everything else (note that such a setup will
+expose your `_werc/config` files, which usually should not be a security
+issue).