uri: fix invalid uris + readme edit

[plowsof]

# points to the rooms alias, but should be %23 for it to be a valid URI. however, ! does not work for some reason, i see failed to join room.

To confirm , enter https://matrix.to/#/#monero:monero.social @ https://0mg.github.io/tools/uri/

[netlify[bot]]

✅ Deploy Preview for barolo-time-757cf9 ready!

Built without sensitive environment variables

Name	Link
🔨 Latest commit	624ada806f9656b703c78f5abf1c31a379e653ec
🔍 Latest deploy log	https://app.netlify.com/sites/barolo-time-757cf9/deploys/65ba1f1c89291b0008328cae
😎 Deploy Preview	https://deploy-preview-2234--barolo-time-757cf9.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.