Contact information is outdated / has broken links

[SimJoSt]

On the about page the contact information is outdated and some links are broken: https://addons.thunderbird.net/En-US/about#:~:text=appreciate%20their%20work.-,I%20have%20a%20question,-A%20good%20place

The link to the support page leads to a 404: https://support.mozilla.org/products/firefox/manage-preferences-and-add-ons-firefox/install-and-manage-add-ons
I wasn't able to find a similar page. Especially, since it was linking to a page about Firefox, even though it should be about Thunderbird.

The link to the contact page leads to a 404: https://addons.thunderbird.net/developers/docs/policies/contact
Maybe this could be a replacement: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Contact_us

This makes it hard for people to reach out, if they have issues with stuff that relates to personal data.

The links are set in the following file with the last change made on it being 8 years ago:

addons-server/src/olympia/pages/templates/pages/about.lhtml

Lines 66 to 76 in 2065c2e

	<h3>{{ _('I have a question') }}</h3>
	<p>{% trans sumo_url="https://support.mozilla.org/products/firefox/manage-preferences-and-add-ons-firefox/install-and-manage-add-ons",
	forum_url="https://discourse.mozilla-community.org/c/add-ons"
	%}A good place
	to start is <a href="{{ sumo_url }}">Support</a> Mozilla.
	If you don't find an answer there, you can <a href="{{ forum_url }}"> ask on our
	forums</a>.{% endtrans %}</p>
	<p>{% trans url="/developers/docs/policies/contact" %}If you really need to
	contact someone from the Mozilla team, please see our <a href="{{ url }}">
	contact information</a> page.{% endtrans %}</p>

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