🎨 delete install via snap, add binary guide, add badges

[zwpaper]

snap is not more maintained:
#79
#392

badges preview

I changed the license to blue from orange, as I checked some trending repos and blue is a more common choice.

[codecov-commenter]

Codecov Report

Merging #401 into master will increase coverage by 0.26%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #401      +/-   ##
==========================================
+ Coverage   69.65%   69.92%   +0.26%     
==========================================
  Files          19       19              
  Lines        1908     1935      +27     
==========================================
+ Hits         1329     1353      +24     
- Misses        579      582       +3     

Impacted Files	Coverage Δ
src/color.rs	79.00% <0.00%> (-0.42%)	⬇️
src/flags.rs	64.00% <0.00%> (-0.17%)	⬇️
src/core.rs	0.00% <0.00%> (ø)
src/meta/mod.rs	18.62% <0.00%> (ø)
tests/integration.rs	100.00% <0.00%> (ø)
src/display.rs	26.66% <0.00%> (+0.27%)	⬆️
src/app.rs	73.91% <0.00%> (+0.57%)	⬆️

---

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[meain]

@zwpaper What do you think about having a script that we can host in this repo which the user can just curl and pipe to bash which would pick the latest version and correct architecture and pull down the file and install it?
Not sure how this would work on Windows though.

[zwpaper]

@meain happy that we have the same idea.
actually I have done some research for this

In my previous idea, we could just use GitHub assets.
GitHub offered a static link for the latest release, we could omit the version in assets name, and make latest static.

For example

curl -sSL github.com/Peltoche/lsd/releases/latest/download/lsd-$OS-$ARCH.tar.gz | tar zxvf - -C /usr/local/bin/

If we could figure out a solution, I can update this PR and make it happen

[zwpaper]

BTW, I nearly not use Windows for dev at all, Windows may be a tough problem for me

[meain]

I am not really sure about the Windows situation either. Don't have access to a Windows machine.

Btw, we probably should be using uname -s and uname -m as that should work pretty well on mac as well.

[meain]

We could probably drop https://github.com/Peltoche/lsd/blob/master/.snapcraft.yaml since we are not having snap anymore.

[zwpaper]

@meain
sorry for the delay, I was overloaded last week...
this PR should be ok to go now

[meain]

No worries, thanks.