Issue 528 (#529)

* tweak lambdify for constants

* adjust

* rework

* deploy docs through gh-pages, not juliahub

Author: jverzani

docs/make.jl

@@ -30,8 +30,6 @@ pages = [
 # Documenter can also automatically deploy documentation to gh-pages.
 # See "Hosting Documentation" and deploydocs() in the Documenter manual
 # for more information.
-#=
 deploydocs(
-    repo = ""
+    repo = "github.com/JuliaPy/SymPy.jl/"
 )
-=#