Renamed anon(ymous)-everyman and changed ID

'anon' seems to be the convention to name anonymous authors in file names
in this corpus.

I also removed xml prologue, stylesheet and model instructions since these also
don't seem to be used here.

index.xml

@@ -434,4 +434,5 @@
   <item id="eng000432" sourceid="A93178" slug="shirley-the-sisters" wikidata="Q7764538"/>
   <item id="eng000433" sourceid="B07101" slug="shirley-the-triumph-of-peace" wikidata="Q7770291"/>
   <item id="eng000434" sourceid="A07976" slug="nabbes-the-spring-s-glory"/>
+  <item id="eng000435" slug="anon-everyman"/>
 </index>

tei/anonymous-everyman.xml → tei/anon-everyman.xml

@@ -1,8 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<?xml-stylesheet type="text/css" href="../css/tei.css"?>
-<?xml-model href="https://dracor.org/schema.rng" type="application/xml" schematypens="http://relaxng.org/ns/structure/1.0"?>
-<TEI xmlns="http://www.tei-c.org/ns/1.0" xml:id="test000005" xml:lang="eng">
-  <!-- test -->
+<TEI xmlns="http://www.tei-c.org/ns/1.0" xml:id="eng" xml:lang="eng000435">
   <teiHeader>
     <fileDesc>
       <titleStmt>