Update documentation links

Author: ararslan

README.md

@@ -11,7 +11,7 @@
 
 **Installation**: `julia> Pkg.add("Convex")`
 
-- **Detailed documentation and examples** for Convex.jl ([stable](http://convexjl.readthedocs.io/en/stable) | [latest](http://convexjl.readthedocs.io/en/latest)).
+- **Detailed documentation and examples** for Convex.jl ([stable](https://juliaopt.github.io/Convex.jl/stable) | [latest](https://juliaopt.github.io/Convex.jl/dev)).
 - If you're running into **bugs or have feature requests**, please use the [Github Issue Tracker](https://github.com/JuliaOpt/Convex.jl/issues>).
 - For usage questions, please contact us via [Discourse](https://discourse.julialang.org/c/domain/opt).