Starts backends.txt with bits from nimrodc.txt.

doc/nimrodc.txt

@@ -551,8 +551,18 @@ against. For instance, to link statically against Lua this command might work
 on Linux::
 
   nimrod c --dynlibOverride:lua --passL:liblua.lib program.nim
-
-
+
+
+Backend language options
+========================
+
+The typical compiler usage involves using the ``compile`` or ``c`` command to
+transform a ``.nim`` file into one or more ``.c`` files which are then
+compiled with the platform's C compiler into a static binary. However there
+are other commands to compile to C++, Objective-C or Javascript. More details
+can be read in the `Nimrod Backend Integration document <backends.html>`_.
+
+
 Nimrod documentation tools
 ==========================
 
@@ -696,35 +706,3 @@ efficient:
     else: quit(errorStr(p, "expected: console or gui"))
   of "license": c.license = UnixToNativePath(k.value)
   else: quit(errorStr(p, "unknown variable: " & k.key))
-
-
-The JavaScript target
-=====================
-
-Nimrod can also generate `JavaScript`:idx: code. However, the
-JavaScript code generator is experimental!
-
-Nimrod targets JavaScript 1.5 which is supported by any widely used browser.
-Since JavaScript does not have a portable means to include another module,
-Nimrod just generates a long ``.js`` file.
-
-Features or modules that the JavaScript platform does not support are not
-available. This includes:
-
-* manual memory management (``alloc``, etc.)
-* casting and other unsafe operations (``cast`` operator, ``zeroMem``, etc.)
-* file management
-* most modules of the Standard library
-* proper 64 bit integer arithmetic
-* unsigned integer arithmetic
-
-However, the modules `strutils`:idx:, `math`:idx:, and `times`:idx: are
-available! To access the DOM, use the `dom`:idx: module that is only
-available for the JavaScript platform.
-
-To compile a Nimrod module into a ``.js`` file use the ``js`` command; the
-default is a  ``.js`` file that is supposed to be referenced in an ``.html``
-file. However, you can also run the code with `nodejs`:idx:\:  
-
-  nimrod js -d:nodejs -r examples/hallo.nim
-