Changed some fonts and fix missing email icon

_includes/author-links.html

@@ -23,7 +23,7 @@
     {%- if _author.email -%}
       <li title="{{ _locale_string_email }}">
       <a class="button button--circle mail-button" itemprop="email" href="mailto:{{ _author.email }}" target="_blank">
-        <i class="fas fa-envelope"></i>
+        <div class="icon">{%- include svg/icon/social/mail.svg -%}</div>
       </a>
     {%- endif -%}
 

_includes/head.html

@@ -21,4 +21,8 @@
 {%- assign _sources = __return -%}
 <link rel="stylesheet" href="{{ _sources.font_awesome }}" >
 
+<style>
+    @import url('https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Roboto+Slab:wght@100..900&family=ZCOOL+XiaoWei&display=swap')
+</style>
+
 {%- include head/custom.html -%}