add logo and fix typo in deploydocs

Author: mileslucas

docs/make.jl

@@ -1,7 +1,6 @@
 using Polynomials, Documenter
 
 makedocs(modules = [Polynomials],
-    clean = false,
     format = Documenter.HTML(prettyurls = get(ENV, "CI", nothing) == "true"),
     sitename = "Polynomials.jl",
     authors = "Jameson Nash, Keno Fischer, and other contributors",
@@ -10,4 +9,4 @@ makedocs(modules = [Polynomials],
     ],
 )
 
-deploydocs("github.com/JuliaMath/Polynomials.jl.git")
+deploydocs(repo = "github.com/JuliaMath/Polynomials.jl.git")