gf-book web page index and toc

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diff --git a/gf-book/examples/chapter8/LogicBEng.gf b/gf-book/examples/chapter8/LogicBEng.gf
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+concrete LogicEng of Logic = open 
+  SyntaxEng, (P = ParadigmsEng), SymbolicEng, Prelude in {
+lincat
+  Stm  = Text ;
+  Prop = S ;
+  Atom = Cl ; 
+  Ind  = NP ; 
+  Dom  = CN ; 
+  Var  = NP ; 
+  [Prop] = [S] ; 
+  [Var]  = NP ; 
+lin
+  SProp = mkText ;
+  And = mkS and_Conj ;      -- A, B ... and C
+  Or = mkS or_Conj ;        -- A, B ... or C
+  If A B =                  -- if A B
+    mkS (mkAdv if_Subj A) B ;  
+  Not A =                   -- it is not the case that A
+    mkS negativePol (mkCl 
+      (mkVP (mkNP the_Quant 
+         (mkCN case_CN A)))) ; 
+  All xs A B =              -- for all A's xs, B
+    mkS (mkAdv for_Prep 
+      (mkNP all_Predet (mkNP a_Quant 
+         plNum (mkCN A xs)))) B ;
+  Exist xs A B =            -- for some A's xs, B
+    mkS (mkAdv for_Prep 
+      (mkNP somePl_Det (mkCN A xs))) B ;
+  PAtom = mkS ;
+  IVar x = x ;
+  VString s = symb s ;
+  BaseProp A B = mkListS A B ; 
+  ConsProp A As = mkListS A As ;
+  BaseVar x = x ;
+  ConsVar x xs = mkNP and_Conj (mkListNP x xs) ;
+oper
+  case_CN : CN = mkCN (P.mkN "case") ;
+}