Wrong GitInfo editURL on Windows

[reuixiy]

hugo-theme-meme/layouts/partials/components/post-gitinfo.html

Lines 42 to 50 in e927542

	{{ with .Site.Params.repoEditURL }}
	{{ $contentDir := (cond $.Site.IsMultiLingual (printf `/%s/` $.Site.Params.contentDir) "/content/") }}
	<div class="gitinfo-item edit">
	<a href="{{ . }}{{ $contentDir }}{{ $.Path }}" target="_blank" rel="noopener">
	{{- partial "utils/icon.html" (dict "$" $ "name" $.Site.Params.editIcon "class" "edit-icon") -}}
	{{- $.Site.Params.editText -}}
	</a>
	</div>
	{{ end }}

So in post-gitinfo.html we use .Path to combine editURL, it works well on Linux, but not working on Windows.

On Windows, .Path like foo/bar will be "converted" to foo\bar, which produces a wrong URL.

Also, we should check all usages of .Path and .Dir in MemE.

[reuixiy]

Notes:

1. https://stackoverflow.com/a/40002602
2. Add ToSlash template func gohugoio/hugo#2394
3. tpl: Add filepath.FromSlash template func gohugoio/hugo#3187
4. Proposal: Add filepath template namespace gohugoio/hugo#4269
5. https://gohugo.io/functions/path.base/