Fix translation operator in Ising CFT example

[leburgel]

Fixes the translation operator in the Ising CFT example. This was (I assume) accidentally changed to the identity in #290, making all the momenta identically zero. Originally noticed by noticed by Meng Cheng, and reported by @tangwei94.

While I was at it, I changed the example checksum generation to use the relative path similar to what was done in QuantumKitHub/PEPSKit.jl#227. When attempting to rebuild the Ising example I noticed that it was actually rebuilding all of them, so seemed appropriate to squeeze this in here to prevent this in the future.

[codecov]

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[leburgel]

@dartsushi, can you check that the plots here now give what you would expect?

[dartsushi]

@dartsushi, can you check that the plots here now give what you would expect?

Perfect. Thanks for fixing those!

[leburgel]

I added two sentences on how the scaling dimensions relate to the excitation spectrum, and I updated the MPS plot to actually use the MPS data for $L=20$ (the plot just showed the ED data again). I also chose to systematically plot the scaling dimensions versus conformal spin instead of momentum, since this removes the dependence on system size and gives the same plot for the ED and MPS data.

Should be good to go now I think.

[lkdvos]

Thanks for fixing this!