Update jupyter notebooks

[blegat]

I switched from PyPlot to CairoMakie to remove the dependency on python as it sometimes cause installation issues.
Additionally,

• for mandelbrot, I removed the build_q because there was already a one-liner that could be slightly tweaked to compute exactly the same thing in the previous cell.
• for Transpose, I fixed the error MethodError: no method matching unsafe_convert(::Type{Ptr{Float32}}, ::OpenCL.cl.LocalMem{Float32}).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.96%. Comparing base (1943f1c) to head (18eae31).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #291   +/-   ##
=======================================
  Coverage   72.96%   72.96%           
=======================================
  Files          12       12           
  Lines         614      614           
=======================================
  Hits          448      448           
  Misses        166      166           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[github-actions]

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

Click here to view the suggested changes.

diff --git a/examples/hands_on_opencl/ex08/matmul.jl b/examples/hands_on_opencl/ex08/matmul.jl
index c03e8bc..89da753 100644
--- a/examples/hands_on_opencl/ex08/matmul.jl
+++ b/examples/hands_on_opencl/ex08/matmul.jl
@@ -151,7 +151,7 @@ else
 
 @info("=== OpenCL, matrix mult, C row, priv A, B, cols loc, order $Ndim ====")
 
-ORDER = 2
+    ORDER = 2
 
 for i in 1:COUNT
     fill!(h_C, 0.0)
diff --git a/examples/hands_on_opencl/ex09/pi_ocl.jl b/examples/hands_on_opencl/ex09/pi_ocl.jl
index cef4977..bc27dc2 100644
--- a/examples/hands_on_opencl/ex09/pi_ocl.jl
+++ b/examples/hands_on_opencl/ex09/pi_ocl.jl
@@ -18,7 +18,7 @@ src_dir = dirname(Base.source_path())
 
 #
 # Some constant values
-INSTEPS = 512*512*512
+INSTEPS = 512 * 512 * 512
 ITERS = 262144
 
 # Set some default values:
diff --git a/examples/performance.jl b/examples/performance.jl
index e2f4ab4..dd69865 100644
--- a/examples/performance.jl
+++ b/examples/performance.jl
@@ -107,5 +107,5 @@ end
 # ex. N_WORKERS = 1 is non parallel execution on the gpu
 
 const N_DATA_PTS = Int(2^2) # ~8 million
-const N_WORKERS  = Int(2^2)
+const N_WORKERS = Int(2^2)
 cl_performance(N_DATA_PTS, N_WORKERS)