Email: `<foo>` words are stripped from the text version

[stsewd]

When sending emails, we send both, HTML and text versions. For the text version, we use this template, with a striptags filter.

https://github.com/readthedocs/readthedocs.org/blob/3fee5e84d03cd1794dcfbd78b8f8585adbd4d6f9/readthedocs/templates/core/email/common.txt#L3-L3

We probably are using that as a fallback for emails that don't have a text only version. This isn't a problem most of the time, but we recently started sending emails using Markdown for the text version, in Markdown we can include links using the <https://example.com> syntax, that is recognized as a tag and being deleted.

To fix this, we have a couple of options:

• Avoid using the <link> syntax. This is probably hard to avoid.
• Don't use the striptags filter, always make sure to have a text form of each email.
• Stop including the text version of the email.

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