Format README, fix test groups

[mtfishman]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.00%. Comparing base (1b2c513) to head (bcbd3df).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #90   +/-   ##
=======================================
  Coverage   85.00%   85.00%           
=======================================
  Files           1        1           
  Lines          80       80           
=======================================
  Hits           68       68           
  Misses         12       12           

Flag	Coverage Δ
docs	69.33% <ø> (-5.67%)	⬇️

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[github-actions]

Your PR requires formatting changes to meet the project's style guidelines.
Please consider running Runic (git runic main) to apply these changes.

Click here to view the suggested changes.

diff --git a/src/ITensorPkgSkeleton.jl b/src/ITensorPkgSkeleton.jl
index 2e75eef..e6a6955 100644
--- a/src/ITensorPkgSkeleton.jl
+++ b/src/ITensorPkgSkeleton.jl
@@ -155,11 +155,11 @@ function pkg_registration_message(; pkgname, path)
     ```julia
     julia> using Pkg: Pkg
 
-    julia> Pkg.Registry.add(url = "https://github.com/ITensor/ITensorRegistry")
+        julia> Pkg.Registry.add(url = "https://github.com/ITensor/ITensorRegistry")
     ```
     or:
     ```julia
-    julia> Pkg.Registry.add(url = "git@github.com:ITensor/ITensorRegistry.git")
+        julia> Pkg.Registry.add(url = "git@github.com:ITensor/ITensorRegistry.git")
     ```
     if you want to use SSH credentials, which can make it so you don't have to enter your Github ursername and password when registering packages.