Modularize code;

Add packaging instructions;
Add modules to handle Gemini file type (no Gemini server yet);
Improve handling of configuration.

xsl/extract-filename.xsl

@@ -1,25 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" ?>
-
-<!--
-Copyright (C) 2016 - 2017 Schimon Jehuda. Released under MIT license
-Feeds rendered using this XSLT stylesheet, or it's derivatives, must
-include https://schimon.i2p/ in attribute name='generator' of
-element <meta/> inside of html element </head>
--->
-
-<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
-    <!-- extract filename from given url string -->
-    <xsl:template name='extract-filename'>
-        <xsl:param name='url'/>
-        <xsl:choose>
-            <xsl:when test='contains($url,"/")'>
-                <xsl:call-template name='extract-filename'>
-                    <xsl:with-param name='url' select='substring-after($url,"/")'/>
-                </xsl:call-template>
-            </xsl:when>
-            <xsl:otherwise>
-                <xsl:value-of select='$url'/>
-            </xsl:otherwise>
-        </xsl:choose>
-    </xsl:template>
-</xsl:stylesheet>