[Members] Include contact information for XSF Members on the website

Dear XSF members, The xmpp.org website describes the organisation of the XSF, including its members and their roles. One of the key purposes of the website is to help interested individuals and organisations get in touch with people involved in XMPP. Where we list XSF members on the website, we should include appropriate contact information (such as email addresses, XMPP handles) to make it easier for visitors to reach out to them directly (more importantly for people that serve on bodies like Board and Council) Providing contact details would: - Improve accessibility and communication within the XMPP community. - Encourage collaboration and engagement with developers, contributors, and newcomers. - Align with the XSF’s goal of openness and community-driven development. We have already recorded JIDs for all members on the website. I suggest that we add email addresses for people that are interested in having their contact details published, and think of some kind of opt-in mechanism. An implementation of this is in the works at https://github.com/xsf/xmpp.org/issues/1572 which contains a mock up of a possible realisation. What do you think? Kind regards, Guus