Sdg23 add events page

[namiroues]

This PR addresses #441.

[micaela-matta]

looking good:)

[namiroues]

Thanks @micaela-matta for your comments. I have incorporated them.

[jennaswa]

Thank you so much for putting this together, @namiroues! As we discussed today, I think it would be good to make as much information as possible about our events that is publicly available accessible from this page. I have added a number of suggestions for consideration to help achieve this.

In addition, I added email links to the UGM and workshop organizing committees to create a communication channel for people who might want to get involved. I'd appreciate thoughts from others on this.

[jennaswa]

I also haven't added it myself, because I'm not sure how detailed we should go, but it'd also be great to highlight hackathons here. Maybe just a general blip in the intro paragraphs is enough, as the UGM/workshop materials should link to hackathon materials in most cases.

Per conversation in #444, it might make sense to link directly to the past workshop information here.

[namiroues]

Thanks @jennaswa for your comments. I've addressed them. Regarding this comment, I will add this to the TODO list for final refinement.

[micaela-matta]

@jennaswa why do we need to link to past workshop announcements?

[micaela-matta]

@orbeckst @jennaswa can you please check it's all good? if I don't hear from you in the next couple of days, I'll merge

[orbeckst]

@namiroues can you please replace explicit URLs to internal posts with {% post_url ... %}? Otherwise looks very good.

(Sorry I hadn't reviewed before, I was happy to have @micaela-matta and @jennaswa look over events but as I was asked to comment, here is my review.)

[orbeckst]

This could be an automated piece of code, based on tags. (Future work.)

[namiroues]

Thanks @orbeckst! Done!

[micaela-matta]

@jennaswa I'm going to go ahead and merge for now, but @namiroues compiled a todo list we can use for future changes. let's have another look once all the pages are updated