Remove intro table from intro entirely

Most of it was already duplicated in filename extensions;
also update that table to reflect preferred first, and
remove cro extension - not part of core, didn't change
anyway.

Author: coke

doc/Language/filename-extensions.pod6

@@ -5,16 +5,15 @@
 =SUBTITLE The extensions recommended for files with Raku content.
 
 =begin table
-File contents          | Extensions recommended or used at one time | Current recommendation
-============================================================================================
-Language files:        |                                            |
-Raku script            | .pl, .p6                                   | .raku
-Raku module            | .pm, .pm6                                  | .rakumod
-Raku documentation     | .pm, pm6, pod, pod6                        | .rakudoc
-Test files in raku     | .t                                         | .rakutest
-Not Quite Perl (NQP)   |                                            | .nqp
-Module specific files: |                                            |
-Cro templates          |                                            | .crotmp
+File contents          | Extension | Historic extensions
+========================================================
+Raku script            | .raku     | .pl, .p6
+Raku module            | .rakumod  | .pm, .pm6
+Raku documentation     | .rakudoc  | .pm, pm6, pod, pod6
+Test files in raku     | .rakutest | .t
+Not Quite Perl (NQP)   | .nqp      |
+
+Note that in most cases, the historic extensions will still work.
 
 =end table
 

doc/Language/intro.pod6

@@ -63,23 +63,4 @@ that does not work as the programmer intended. This section identifies some
 of them. It is worth reviewing when something doesn't quite work out.
 =end item
 
-=begin item
-Note the name change to Raku from Perl 6 has resulted in some objects
-having changed names and their former names, while still available, are
-deprecated and their use is not recommended in new code. Those items
-are shown in the following table:
-
-=begin table :caption<Raku object names versus deprecated Perl 6 names>
-Raku      | Perl 6   | Notes
-==========+==========+======
-raku      | perl     | routine
-RAKULIB   | PERL6LIB | environment variable for module paths
-.raku     | .p6      | file extension for Raku scripts
-.rakumod  | .pm6     | file extension for Raku modules
-.rakutest | .t       | file extension for Raku tests
-=end table
-
-=end item
-
-
 =end pod