feat: update README & enhance setup script

[thaodt]

Summary

This PR tries to resolve the issue posted yesterday.

This PR fixes/implements the following bugs/features

• [ x ] Bug 1: typo error in README.md line 193 script/
• [ x ] Bug 2: Running build rs-wnfs build --all get wasm-opt command not found.
• [ x ] Feature: enhance setup script rs-wnfs.sh, try to make use of superuser privileges when creating a symlink.

Test plan (required)

• remove /usr/local/bin/rs-wnfs.
• rerun script by command sh scripts/rs-wnfs.sh setup and you should see the result:
  

Closing issues

Fixes #63

After Merge

• Does this change invalidate any docs or tutorials? If so ensure the changes needed are either made or recorded
• Does this change require a release to be made? Is so please create and deploy the release

[codecov-commenter]

Codecov Report

Merging #65 (f4beee0) into main (0228c17) will decrease coverage by 0.14%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #65      +/-   ##
==========================================
- Coverage   77.28%   77.14%   -0.15%     
==========================================
  Files          26       26              
  Lines        1422     1422              
==========================================
- Hits         1099     1097       -2     
- Misses        323      325       +2     

Impacted Files	Coverage Δ
crates/fs/private/hamt/pointer.rs	68.96% <0.00%> (-3.45%)	⬇️

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[thaodt]

@appcypher @matheus23 hmm, is it normal when I just changed the bash script but codecov checked rust files? 👀

[matheus23]

Don't worry about the coverage checks :) They run on every PR AFAIK.

[matheus23]

Thanks for the contribution! :)

We may move away from shellscript-based build scripting to something else in the future, but in the mean time this is really helpful 👍