Doc: Migrate Installation instructions to conda-forge

[cbueth]

As the superblockify conda-forge feedstock now is on the main channel, see conda-forge/superblockify-feedstock@5b9256e, installation instructions need to be updated in the README.md and documentation:

conda create -n sb_env -c conda-forge superblockify

Closes #97

Reviewing Questions:

• Any other changes in the README.md or installation page (docs/installation.md) needed?
• Add more info to the website landing page (docs/index.rst)?

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.42%. Comparing base (6e5f9bb) to head (5f53ea7).
Report is 4 commits behind head on main.

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  Coverage   94.42%   94.42%           
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  Files          31       31           
  Lines        1885     1885           
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  Hits         1780     1780           
  Misses          4        4           
  Partials      101      101           

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[mszell]

Thx! The how to cite part looks very good.
We could add one sentence just below the superblockify_concept.png image: Read more about superblockify here: https://doi.org/10.21105/joss.06798
From my side please merge/push.

[anastassiavybornova]

Tiny comment, since we're at it, I'd add our github handles to the Credits part (incl yours Calrson).
Rest looks good to me!