fix typo for sorting

Author: jiuntian

_includes/cv/education.liquid

@@ -1,5 +1,5 @@
 <ul class="card-text font-weight-light list-group list-group-flush">
-  {% assign education = entry[1] | sort: 'entry.start_date' | reverse %}
+  {% assign education = entry[1] | sort: 'start_date' | reverse %}
   {% for content in education %}
     <li class="list-group-item">
       <div class="row">

_includes/cv/publications.liquid

@@ -1,5 +1,5 @@
 <ul class="card-text font-weight-light list-group list-group-flush">
-  {% assign publications = entry[1] | sort: 'entry.date' | reverse %}
+  {% assign publications = entry[1] | sort: 'date' | reverse %}
   {% for content in publications %}
     <li class="list-group-item">
       <div class="row">

_includes/cv/work.liquid

@@ -1,5 +1,5 @@
 <ul class="card-text font-weight-light list-group list-group-flush">
-  {% assign work = entry[1] | sort: 'entry.start_date' | reverse %}
+  {% assign work = entry[1] | sort: 'start_date' | reverse %}
   {% for content in work %}
     <li class="list-group-item">
       <div class="row">