Remove unused textbox imports

When we converted textboxes on Notify to govuk-frontend design system
style with @tombye , we did not remove the imports.
This work is now done in this commit.

Some things that will still stay in our repo for now:

textbox macro in our components folder and associated css
textboxes which are really textarea fields (🤷 how do they work)
textboxes on the styleguide page

We should revisit this when we convert textarea fields
to govuk-frontend.

app/templates/views/templates/action_blocked.html

@@ -1,5 +1,4 @@
 {% extends "withnav_template.html" %}
-{% from "components/textbox.html" import textbox %}
 {% from "components/page-header.html" import page_header %}
 {% from "components/page-footer.html" import page_footer %}
 {% from "components/message-count-label.html" import message_count_label %}

app/templates/views/templates/choose.html

@@ -1,7 +1,6 @@
 {% from "components/folder-path.html" import folder_path, page_title_folder_path %}
 {% from "components/pill.html" import pill %}
 {% from "components/message-count-label.html" import message_count_label %}
-{% from "components/textbox.html" import textbox %}
 {% from "components/live-search.html" import live_search %}
 {% from "components/form.html" import form_wrapper %}
 {% from "components/page-header.html" import page_header %}

app/templates/views/templates/manage-template-folder.html

@@ -1,6 +1,5 @@
 {% extends "withnav_template.html" %}
 {% from "components/folder-path.html" import folder_path, page_title_folder_path %}
-{% from "components/textbox.html" import textbox %}
 {% from "components/page-footer.html" import page_footer %}
 {% from "components/form.html" import form_wrapper %}
 

app/templates/views/templates/template.html

@@ -2,7 +2,6 @@
 {% from "components/banner.html" import banner_wrapper %}
 {% from "components/folder-path.html" import folder_path, page_title_folder_path %}
 {% from "components/page-footer.html" import page_footer %}
-{% from "components/textbox.html" import textbox %}
 {% from "components/api-key.html" import api_key %}
 {% from "components/button/macro.njk" import govukButton %}
 

app/templates/views/templates/template_history.html

@@ -1,6 +1,5 @@
 {% extends "withnav_template.html" %}
 {% from "components/page-footer.html" import page_footer %}
-{% from "components/textbox.html" import textbox %}
 
 {% block service_page_title %}
   {{ template.name }}