[theme] fix html classes

templates/nav.html

 <nav class="w3-bar w3-large">
-  <a href="/" class="w3-bar-item w3-button {% if current_path %}{% if current_path == "/" %}active{% endif %}{% endif %}"><img alt="" class="icon" src="/img/duniter-logo_alt.svg"/> Duniter</a>
+  {# --- home button --- -#}
+  <a href="/" class="w3-bar-item w3-button {% if current_path %}{% if current_path == "/" %} active{% endif %}{% endif %}"><img alt="" class="icon" src="/img/duniter-logo_alt.svg"/> Duniter</a>
   
   {%- set index = get_section(path="_index.md") -%}
   {%- set contributeurs = get_section(path="contributeurs/_index.md") -%}
 
+  {# --- main links --- -#}
   {%- for p in index.pages | concat(with=contributeurs) %}
     {%- if not p.extra.hide -%}
     <a href="{{ p.permalink }}" class="w3-bar-item w3-button
-      {%- if current_path %}{% if current_path == p.path %}active{% endif %}{% endif -%}
+      {%- if current_path %}{% if current_path == p.path %} active{% endif %}{% endif -%}
       ">{{p.title}}</a>
     {%- endif -%}
   {% endfor %}
 
+  {# --- langage dropdown --- -#}
   <div class="w3-dropdown-hover w3-dropdown-click w3-right">
     <button class="w3-button" style="font-size: 1.6em; padding: 0 10px;">🇫🇷</button>
     <div class="w3-dropdown-content w3-bar-block w3-light-grey" style="min-width: 29px;">
@@ -19,6 +22,7 @@
     </div>
   </div>
 
+  {# --- useful links --- -#}
   <div class="w3-dropdown-hover w3-dropdown-click w3-right">
     <button class="w3-button">Liens <i class="fa fa-caret-down"></i></button>
     <div class="w3-dropdown-content w3-bar-block w3-light-grey">
@@ -28,12 +32,13 @@
       <a rel="me" href="https://mamot.fr/@duniter" class="w3-bar-item w3-button"><img alt="m" class="icon" src="https://simpleicons.org/icons/mastodon.svg"/> Mastodon</a>
     </div>
   </div>
-
+  
+  {# --- right links --- -#}
   {%- for s in index.subsections | reverse -%}
   {%- set subsection = get_section(path=s) -%}
     {%- if not subsection.extra.hide and subsection.path != contributeurs.path -%}
     <a href="{{ subsection.permalink }}" class="w3-bar-item w3-button w3-right
-      {%- if current_path %}{% if current_path is starting_with(subsection.path) %}active{% endif %}{% endif -%}
+      {%- if current_path %}{% if current_path is starting_with(subsection.path) %} active{% endif %}{% endif -%}
       ">{{subsection.title}}</a>
     {%- endif -%}
   {%- endfor -%}