Removed some erp5_data_notebook portal_skins because they no longer exist in JupyterCompile

@Tyagov @luke 

During development of JupyterCompile several functions have been used and then removed but their portal_skins remain in ERP5. The purpose of this MR is to remove those skins, since they do nothing. The skins in question are Base_displayHTML, Base_displayImage, Base_saveImage, Base_updateLocalVariableDict and getError.

/reviewed-on nexedi/erp5!289

bt5/erp5_data_notebook/SkinTemplateItem/portal_skins/erp5_data_notebook/Base_displayHTML.xml

-<?xml version="1.0"?>
-<ZopeData>
-  <record id="1" aka="AAAAAAAAAAE=">
-    <pickle>
-      <global name="ExternalMethod" module="Products.ExternalMethod.ExternalMethod"/>
-    </pickle>
-    <pickle>
-      <dictionary>
-        <item>
-            <key> <string>_function</string> </key>
-            <value> <string>Base_displayHTML</string> </value>
-        </item>
-        <item>
-            <key> <string>_module</string> </key>
-            <value> <string>JupyterCompile</string> </value>
-        </item>
-        <item>
-            <key> <string>id</string> </key>
-            <value> <string>Base_displayHTML</string> </value>
-        </item>
-        <item>
-            <key> <string>title</string> </key>
-            <value> <string></string> </value>
-        </item>
-      </dictionary>
-    </pickle>
-  </record>
-</ZopeData>

bt5/erp5_data_notebook/SkinTemplateItem/portal_skins/erp5_data_notebook/Base_displayImage.xml

-<?xml version="1.0"?>
-<ZopeData>
-  <record id="1" aka="AAAAAAAAAAE=">
-    <pickle>
-      <global name="ExternalMethod" module="Products.ExternalMethod.ExternalMethod"/>
-    </pickle>
-    <pickle>
-      <dictionary>
-        <item>
-            <key> <string>_function</string> </key>
-            <value> <string>Base_displayImage</string> </value>
-        </item>
-        <item>
-            <key> <string>_module</string> </key>
-            <value> <string>JupyterCompile</string> </value>
-        </item>
-        <item>
-            <key> <string>id</string> </key>
-            <value> <string>Base_displayImage</string> </value>
-        </item>
-        <item>
-            <key> <string>title</string> </key>
-            <value> <string></string> </value>
-        </item>
-      </dictionary>
-    </pickle>
-  </record>
-</ZopeData>

bt5/erp5_data_notebook/SkinTemplateItem/portal_skins/erp5_data_notebook/Base_saveImage.xml

-<?xml version="1.0"?>
-<ZopeData>
-  <record id="1" aka="AAAAAAAAAAE=">
-    <pickle>
-      <global name="ExternalMethod" module="Products.ExternalMethod.ExternalMethod"/>
-    </pickle>
-    <pickle>
-      <dictionary>
-        <item>
-            <key> <string>_function</string> </key>
-            <value> <string>Base_saveImage</string> </value>
-        </item>
-        <item>
-            <key> <string>_module</string> </key>
-            <value> <string>JupyterCompile</string> </value>
-        </item>
-        <item>
-            <key> <string>id</string> </key>
-            <value> <string>Base_saveImage</string> </value>
-        </item>
-        <item>
-            <key> <string>title</string> </key>
-            <value> <string>Base_saveImage</string> </value>
-        </item>
-      </dictionary>
-    </pickle>
-  </record>
-</ZopeData>

bt5/erp5_data_notebook/SkinTemplateItem/portal_skins/erp5_data_notebook/Base_updateLocalVariableDict.xml

-<?xml version="1.0"?>
-<ZopeData>
-  <record id="1" aka="AAAAAAAAAAE=">
-    <pickle>
-      <global name="ExternalMethod" module="Products.ExternalMethod.ExternalMethod"/>
-    </pickle>
-    <pickle>
-      <dictionary>
-        <item>
-            <key> <string>_function</string> </key>
-            <value> <string>UpdateLocalVariableDict</string> </value>
-        </item>
-        <item>
-            <key> <string>_module</string> </key>
-            <value> <string>JupyterCompile</string> </value>
-        </item>
-        <item>
-            <key> <string>id</string> </key>
-            <value> <string>Base_updateLocalVariableDict</string> </value>
-        </item>
-        <item>
-            <key> <string>title</string> </key>
-            <value> <string></string> </value>
-        </item>
-      </dictionary>
-    </pickle>
-  </record>
-</ZopeData>

bt5/erp5_data_notebook/SkinTemplateItem/portal_skins/erp5_data_notebook/getError.xml

-<?xml version="1.0"?>
-<ZopeData>
-  <record id="1" aka="AAAAAAAAAAE=">
-    <pickle>
-      <global name="ExternalMethod" module="Products.ExternalMethod.ExternalMethod"/>
-    </pickle>
-    <pickle>
-      <dictionary>
-        <item>
-            <key> <string>_function</string> </key>
-            <value> <string>getError</string> </value>
-        </item>
-        <item>
-            <key> <string>_module</string> </key>
-            <value> <string>JupyterCompile</string> </value>
-        </item>
-        <item>
-            <key> <string>id</string> </key>
-            <value> <string>getError</string> </value>
-        </item>
-        <item>
-            <key> <string>title</string> </key>
-            <value> <string>getError</string> </value>
-        </item>
-      </dictionary>
-    </pickle>
-  </record>
-</ZopeData>