matrix: Add initial docs (closes #11)

[justwheel]

This commit is a first-pass explainer to what Matrix/Riot are and how we use them in the FOSS@RIT community. It also collects some of the rooms I know about but is probably not a complete list.

Closes #11.

I'd like to get two, or maybe even three, reviews on this doc since a lot of folks use Matrix in our community. I requested a review from Tech Team, but also tagged a few people whose eyes I'd like to borrow. 👀

[Tjzabel]

LGTM

[Alch-Emi]

Response to an informal invitation to review

Looks good to me!

There's a few small things I might change/add. (None of very high importance, though)

• I might note that communities as they are currently implemented are not long for this world, and will be replaced with Groups-As-Rooms once MSC 1772 gets merged
• Also, it's kinda a small thing, but I have a really hard time reading the last sentence of the How we use matrix paragraph, even knowing what you're trying to say. Maybe something like "Many of our users use the Matrix network, but can communicate seamlessly with the IRC rooms", if I understood your original meaning correctly?
• It might be useful to add a super short blurb to the "Known Rooms" table with a description of each room. It's not super important, since you can kinda tell based off of the name of the room, but it could also help make it a little bit more clear.

All of that is really just clarity though, and whether or not you want to add them is up to you. Overall, I think it works really well and is a really good description of the relation of FOSS and Matrix

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Addendum: The Riot screenshot used to illustrate communities uses the legacy Riot client, which is most likely not what new Riot users will be using/seeing. It might be helpful to use a screenshot from the redesigned client, so that users might better understand it in context. Something like the attached might be good, though feel free to use a different screenshot, ofc

[justwheel]

Thanks for reviewing @Alch-Emi! 👍 I addressed most of your feedback in commit fd891c6. I decided against adding the description field to the known rooms, because of a limitation where the tables will flow off-screen if too much text is added. I think the room preview in Matrix/Riot will be enough for most cases.

[ct-martin]

@jwflory these would be helpful for the "how we use matrix" section due to how often they get sent to people:

https://opensource.com/article/17/5/introducing-riot-IRC
https://github.com/matrix-org/matrix-appservice-irc/wiki/End-user-FAQ#how-do-i-registeridentify-to-nickserv

[justwheel]

Thanks @ct-martin, I addressed your feedback in commit 99d8842. 👍

[Tjzabel]

@Alch-Emi what do you mean, legacy Riot client?

[jibby0]

The IRC (Freenode) link under How we use Matrix (https://github.com/FOSSRIT/runbook/blob/master/docs/infra/irc) brings me to a 404

Otherwise LGTM: a nice introduction + good links for further reading :)

[ct-martin]

Approving under the assumption that @jibby0 's comment will be fixed

[justwheel]

Thanks everyone for the detailed reviews and feedback! 🎉 I am happy with the feedback collected so far, so I'm going to rebase and merge this PR. 🎬

@jibby0:
The IRC (Freenode) link under How we use Matrix (https://github.com/FOSSRIT/runbook/blob/master/docs/infra/irc) brings me to a 404

On GitHub.com this won't work, but when the docs are built and rendered on https://runbook.fossrit.community, this becomes an internal link to the IRC page. When I built them locally, it took me to the right place. 😄