feat(sidebar): add support for external avatar (#53)

add [params.sidebar.avatar] section in config.toml, with 2 fields: local and src

Migration guide:
 - Copy the old value of `params.sidebar.avatar` to `param.sidebar.avatar.src`
 - Set params.sidebar.avatar.local = true

Co-authored-by: Jimmy Cai <jimmehcai@gmail.com>

exampleSite/config.toml

@@ -21,8 +21,10 @@ DefaultContentLanguage = "en"                   # Theme i18n support
         
     [params.sidebar]
         emoji = "🍥"
-        avatar = "img/avatar.png"
         subtitle = "Lorem ipsum dolor sit amet, consectetur adipiscing elit."
+        [params.sidebar.avatar]
+            local = true
+            src = "img/avatar.png"
         
     [params.article]
         math = false

layouts/partials/sidebar/left.html

@@ -8,15 +8,19 @@
     <header class="site-info">
         {{ with .Site.Params.sidebar.avatar }}
             <figure class="site-avatar">
-                {{ $avatar := resources.Get (.) }}
+                {{ if not .local }}
+                    <img src="{{ .src }}" width="300" height="300" class="site-logo" loading="lazy" alt="Avatar">
+                {{ else }}
+                    {{ $avatar := resources.Get (.src) }}
                     
                     {{ if $avatar }}
-                    {{ $avatarResized := $avatar.Resize "300x300" }}
+                        {{ $avatarResized := $avatar.Resize "300x" }}
                         <img src="{{ $avatarResized.RelPermalink }}" width="{{ $avatarResized.Width }}"
                             height="{{ $avatarResized.Height }}" class="site-logo" loading="lazy" alt="Avatar">
                     {{ else }}
                         {{ errorf "Failed loading avatar from %q" . }}
                     {{ end }}
+                {{ end }}
 
                 {{ with $.Site.Params.sidebar.emoji }}
                     <span class="emoji">{{ . }}</span>