Slugify and replace space with hyphens in page path

[manusajith]

Ref: #67

This change replaces spaces in slug with hyphens, but the bug still remains, as the redirection is handled in the front end now. We should either update backend to return the updated changeset or should update frontend with the same logic to replace spaces with hyphens

[yulolimum]

@jamonholmgren

[jamonholmgren]

@manusajith I missed this, sorry about that!

We already have some code to handle slugification, so we should unify the two:

thesis-phoenix/lib/thesis/render.ex

Lines 94 to 99 in a895d18

	defp parameterize(str) do
	str = Regex.replace(~r/[^a-z0-9\-\s]/i, str, "")
	Regex.split(~r/\%20|\s/, str)
	|> Enum.join("-")
	|> String.downcase
	end

Otherwise, 👍 on this change.

Could you also write a test or two?

[jamonholmgren]

@robinheinze and/or @mlaco Let's chat about this at some point.

[silasjmatson]

Closing in favor of #111

Thanks for the help, @manusajith!