updated link and svg links

[dsawali]

closes #2156

• Updated SVG files for Discord logo
• Updated references to the static img SVG in the styling
• Updated links to point to the Discord server

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[zainen]

LGTM nice
do we use a certain source to get our svg?

[dsawali]

LGTM nice do we use a certain source to get our svg?

I don't know if we have a centralized source, but I got the Discord svg from their official docs/site.