Move Vim syntax-highlighter to a Vim subdirectory.

This makes it easier to describe where the syntax-highlighting file
should be installed, and allows us to easily package other Vim runtime
files.

This commit also adds a README that describes how to regenerate the
syntax file.

basis/editors/vim/generate-syntax/generate-syntax.factor

@@ -4,7 +4,7 @@ IN: editors.vim.generate-syntax
 
 : generate-vim-syntax ( -- )
     "misc/factor.vim.fgen" resource-path <fhtml>
-    "misc/factor.vim" resource-path
+    "misc/vim/syntax/factor.vim" resource-path
     template-convert ;
 
 MAIN: generate-vim-syntax

misc/vim/README

@@ -0,0 +1,25 @@
+Vim support for Factor
+----------------------
+
+This directory contains various support files that make editing Factor code
+more pleasant in Vim. The file-layout exactly matches the Vim runtime
+structure, so you can install them by copying the contents of this directory
+into ~/.vim/ or the equivalent path on other platforms (Open Vim and type
+":help 'runtimepath'" for details).
+
+The current set of files is as follows:
+
+    syntax/factor.vim
+        Syntax highlighting for Factor code.
+
+Note: The syntax-highlighting file is automatically generated to include the
+names of all the vocabularies Factor knows about. To regenerate it manually,
+run the following code in the listener:
+
+    USE: editors.vim.generate-syntax
+
+    generate-vim-syntax
+
+...or run it from the command-line:
+
+    factor -run=editors.vim.generate-syntax