Initial release

Initial release of this snippet-extension with the following HTML tags: div, p, ul, li, h1, h2, h3, h4, h5, h6, span, form, button. All HTML tags except for form and button can be Phoenix for loop'ed when you add fl after the tag. Two other Phoenix specific snippets include: Code Render block (<%= %>), and link core component <.link navigate={~p"/"}></.link>