Add icon for discourse and social media section

[lucascolley]

closes gh-600, closes gh-598

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[lucascolley]

@jarrodmillman do you know how I can build the docs locally? I see the following error:

scipy.org on  discourse [!?] via  v3.10.10 
❯ pixi run make html
rm -rf public
git submodule update --init
hugo 
Start building sites … 
hugo v0.141.0+extended darwin/arm64 BuildDate=unknown VendorInfo=conda-forge

ERROR TOCSS-DART: failed to transform "theme-css/sphinx-design/index.scss.css" (text/x-scss): "<stream>:1:1": proto: cannot parse invalid wire-format data
Total in 555 ms
Error: error building site: TOCSS-DART: failed to transform "theme-css/sphinx-design/index.scss.css" (text/x-scss): "<stream>:1:1": proto: cannot parse invalid wire-format data
make: *** [html] Error 1

scipy.org on  discourse [!?] via  v3.10.10 
❯ pixi ls
Package    Version  Build       Size       Kind   Source
dart-sass  1.58.3   hce30654_1  2.4 MiB    conda  dart-sass
hugo       0.141.0  h286801f_0  14.7 MiB   conda  hugo
libcxx     19.1.7   ha82da77_0  511.2 KiB  conda  libcxx

[DietBru]

The Community page has a "Participate online" section, which also could be used to list the Twitter and Mastodon link. Though I am not sure, if all information is up to date there.

Nonetheless, I would vote to merge this PR as is and address the Community in a separate PR.

[j-bowhay]

Thanks for sorting!

[dimpase]

Thanks for taking care of this!