Odoo adds a customized version of the footer when you delete it using the website editor. If you delete this customized view, the footer will revert to the original setting.
Activate developer mode by going to Settings > General Settings, scrolling all the way down and clicking on Activate the developer mode. Then go to Settings > Technical > User Interface > Views and search for footer. You will see 2 views called Footer with a key of website.footer_custom . One of them will have a blank Website field and the other will have the name of the Website from which you deleted the footer. The contents of the second view will look somewhat like so.
<data inherit_id="website.layout" name="Footer">
<xpath expr="//div[@id='footer']" position="replace">
<div id="footer" class="oe_structure oe_structure_solo" t-ignore="true" t-if="not no_footer">
</div>
</xpath>
</data>
Delete this view and your home page will be restored to it's default state.
NOTE: Try this on a copy of the database first.