Prefer relative links for Nim documentation

This is more friendly to those browsing the documentation without
a network connection. The nim-doc package in Debian allows this,
for example.

Also, the domain name being used was not consistent. It could have
been either nim-lang.org or nim-lang.github.io, and those reading
the stable docs could have found themselves suddenly reading the
devel docs instead.

(cherry picked from commit 72147c9ba4)

doc/astspec.txt

@@ -237,7 +237,7 @@ Call with raw string literal
 ----------------------------
 
 This is used, for example, in the ``bindSym`` examples
-[here](http://nim-lang.org/docs/manual.html#macros-bindsym) and with
+[here](manual.html#macros-bindsym) and with
 ``re"some regexp"`` in the regular expression module.
 
 Concrete syntax:
@@ -902,7 +902,7 @@ as the compiler needs to know the type somehow (which it can infer from
 the given assignment).
 
 This is not the same AST for all uses of ``var``. See
-[Procedure declaration](http://nim-lang.org/docs/macros.html#statements-procedure-declaration)
+[Procedure declaration](macros.html#statements-procedure-declaration)
 for details.
 
 Let section
@@ -1361,7 +1361,7 @@ Template declaration
 
 Templates (as well as macros, as we'll see) have a slightly expanded AST when
 compared to procs and iterators. The reason for this is [term-rewriting
-macros](http://nim-lang.org/docs/manual.html#term-rewriting-macros). Notice
+macros](manual.html#term-rewriting-macros). Notice
 the ``nnkEmpty()`` as the second argument to ``nnkProcDef`` and
 ``nnkIteratorDef`` above? That's where the term-rewriting macros go.
 

doc/contributing.rst

@@ -191,7 +191,7 @@ the old name and introduce a new name:
   type Barz  = enum baz0, baz1 {.deprecated.}, baz2
 
 
-See also `Deprecated <https://nim-lang.org/docs/manual.html#pragmas-deprecated-pragma>`_
+See also `Deprecated <manual.html#pragmas-deprecated-pragma>`_
 pragma in the manual.
 
 
@@ -216,7 +216,7 @@ as well as ``testament`` and guarantee they stay in sync.
       assert "baz".addBar == "bazBar"
     result = a & "Bar"
 
-See `parentDir <https://nim-lang.github.io/Nim/os.html#parentDir%2Cstring>`_
+See `parentDir <os.html#parentDir,string>`_
 example.
 
 The RestructuredText Nim uses has a special syntax for including code snippets

doc/gc.rst

@@ -162,9 +162,9 @@ you can pass ``--gc:`` on the compile command with the choosed garbage collector
 - ``--gc:regions`` `Stack <https://en.wikipedia.org/wiki/Memory_management#Stack_allocation>`_ based garbage collector.
 - ``--gc:none`` No garbage collector.
 
-The same Nim code can compile to use any of the garbage collectors,
-the Nim syntax mostly wont change from one garbage collector to another.
-No garbage collector is used for `JavaScript and NodeJS <https://nim-lang.github.io/Nim/backends.html#backends-the-javascript-target>`_ compilation targets.
-`NimScript <https://nim-lang.github.io/Nim/nims.html>`_ target uses Nim VM garbage collector.
+The same Nim code can be compiled to use any of the garbage collectors;
+the Nim syntax generally will not change from one garbage collector to another.
+No garbage collector is used for `JavaScript and NodeJS <backends.html#backends-the-javascript-target>`_ compilation targets.
+`NimScript <nims.html>`_ target uses Nim VM garbage collector.
 
 If you are new to Nim and just starting, the default garbage collector is balanced to fit most common use cases.

doc/tools.rst

@@ -20,7 +20,7 @@ The standard distribution ships with the following tools:
 - | `C2nim <https://github.com/nim-lang/c2nim/blob/master/doc/c2nim.rst>`_
   | C to Nim source converter. Translates C header files to Nim.
 
-- | `niminst <https://nim-lang.org/docs/niminst.html>`_
+- | `niminst <niminst.html>`_
   | niminst is a tool to generate an installer for a Nim program.
 
 - | `nimgrep <nimgrep.html>`_

lib/core/macros.nim

@@ -13,8 +13,8 @@ include "system/inclrtl"
 ## tree (`AST`:idx:). Macros operate on this tree.
 ##
 ## See also:
-## * `macros tutorial <https://nim-lang.github.io/Nim/tut3.html>`_
-## * `macros section in Nim manual <https://nim-lang.github.io/Nim/manual.html#macros>`_
+## * `macros tutorial <tut3.html>`_
+## * `macros section in Nim manual <manual.html#macros>`_
 
 ## .. include:: ../../doc/astspec.txt