replace subdir link with link to the one page from it we want

diff --git a/underlays/basewiki/ikiwiki/subpage b/underlays/basewiki/ikiwiki/subpage
deleted file mode 120000 (symlink)
index dc18335..0000000
--- a/underlays/basewiki/ikiwiki/subpage
+++ /dev/null
@@ -1 +0,0 @@
-../../../doc/ikiwiki/subpage
\ No newline at end of file

diff --git a/underlays/basewiki/ikiwiki/subpage/linkingrules.mdwn b/underlays/basewiki/ikiwiki/subpage/linkingrules.mdwn
new file mode 120000 (symlink)
index 0000000..6694188
--- /dev/null
+++ b/underlays/basewiki/ikiwiki/subpage/linkingrules.mdwn
@@ -0,0 +1 @@
+../../../../doc/ikiwiki/subpage/linkingrules.mdwn
\ No newline at end of file