Fix links.

Author: csyonghe

docs/_includes/stdlib-reference-toc.html

@@ -1,6 +1,6 @@
 @title: Slang Standard Library Reference
 @libname: Slang's Standard Library
-@rootdir: /docs/stdlib-reference/
+@rootdir: /slang/stdlib-reference/
 
 @preamble:
 ---

docs/stdlib-reference/config.txt

@@ -5,20 +5,20 @@ layout: stdlib-reference
 
 Slang's Standard Library defines the following interfaces:
 
-- [IArithmetic](/docs/stdlib-reference/interfaces/IArithmetic/index)
-- [IArithmeticAtomicable](/docs/stdlib-reference/interfaces/IArithmeticAtomicable/index)
-- [IAtomicable](/docs/stdlib-reference/interfaces/IAtomicable/index)
-- [IBitAtomicable](/docs/stdlib-reference/interfaces/IBitAtomicable/index)
-- [IBufferDataLayout](/docs/stdlib-reference/interfaces/IBufferDataLayout/index)
-- [IComparable](/docs/stdlib-reference/interfaces/IComparable/index)
-- [IDefaultInitializable](/docs/stdlib-reference/interfaces/IDefaultInitializable/index)
-- [IDifferentiable](/docs/stdlib-reference/interfaces/IDifferentiable/index)
-- [IDifferentiableFunc](/docs/stdlib-reference/interfaces/IDifferentiableFunc/index)
-- [IDifferentiableMutatingFunc](/docs/stdlib-reference/interfaces/IDifferentiableMutatingFunc/index)
-- [IDifferentiablePtrType](/docs/stdlib-reference/interfaces/IDifferentiablePtrType/index)
-- [IFloat](/docs/stdlib-reference/interfaces/IFloat/index)
-- [IFunc](/docs/stdlib-reference/interfaces/IFunc/index)
-- [IInteger](/docs/stdlib-reference/interfaces/IInteger/index)
-- [ILogical](/docs/stdlib-reference/interfaces/ILogical/index)
-- [IMutatingFunc](/docs/stdlib-reference/interfaces/IMutatingFunc/index)
-- [IRangedValue](/docs/stdlib-reference/interfaces/IRangedValue/index)
+- [IArithmetic](/slang/stdlib-reference/interfaces/IArithmetic/index)
+- [IArithmeticAtomicable](/slang/stdlib-reference/interfaces/IArithmeticAtomicable/index)
+- [IAtomicable](/slang/stdlib-reference/interfaces/IAtomicable/index)
+- [IBitAtomicable](/slang/stdlib-reference/interfaces/IBitAtomicable/index)
+- [IBufferDataLayout](/slang/stdlib-reference/interfaces/IBufferDataLayout/index)
+- [IComparable](/slang/stdlib-reference/interfaces/IComparable/index)
+- [IDefaultInitializable](/slang/stdlib-reference/interfaces/IDefaultInitializable/index)
+- [IDifferentiable](/slang/stdlib-reference/interfaces/IDifferentiable/index)
+- [IDifferentiableFunc](/slang/stdlib-reference/interfaces/IDifferentiableFunc/index)
+- [IDifferentiableMutatingFunc](/slang/stdlib-reference/interfaces/IDifferentiableMutatingFunc/index)
+- [IDifferentiablePtrType](/slang/stdlib-reference/interfaces/IDifferentiablePtrType/index)
+- [IFloat](/slang/stdlib-reference/interfaces/IFloat/index)
+- [IFunc](/slang/stdlib-reference/interfaces/IFunc/index)
+- [IInteger](/slang/stdlib-reference/interfaces/IInteger/index)
+- [ILogical](/slang/stdlib-reference/interfaces/ILogical/index)
+- [IMutatingFunc](/slang/stdlib-reference/interfaces/IMutatingFunc/index)
+- [IRangedValue](/slang/stdlib-reference/interfaces/IRangedValue/index)