Combined graph

[cikzh]

Instead of drawing a graph for the currently selected protocol and monitor, this PR combines all data into a single graph.
It shows all samples of the last 2 days.

Also snuck in a fix for the text being unselectable in the raw sample code block in the page's table.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 55 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.22%. Comparing base (10066cc) to head (11bc608).

Files with missing lines	Patch %	Lines
nts-pool-management/src/graph.rs	0.00%	28 Missing ⚠️
nts-pool-management/src/models/time_source.rs	0.00%	18 Missing ⚠️
nts-pool-management/src/main.rs	0.00%	6 Missing ⚠️
nts-pool-management/src/routes/management.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #502      +/-   ##
==========================================
- Coverage   70.42%   70.22%   -0.20%     
==========================================
  Files          69       69              
  Lines       14785    14823      +38     
==========================================
- Hits        10412    10410       -2     
- Misses       4373     4413      +40     

Flag	Coverage Δ
beta	70.42% <0.00%> (-0.22%)	⬇️
fuzz	59.79% <ø> (-0.69%)	⬇️
fuzz-client_request	34.70% <ø> (-0.69%)	⬇️
fuzz-key_exchange_response	40.54% <ø> (-0.46%)	⬇️
fuzz-record	35.28% <ø> (ø)
fuzz-server_information_response	24.51% <ø> (ø)
msrv	70.14% <0.00%> (-0.19%)	⬇️
stable	70.46% <0.00%> (-0.21%)	⬇️
test	70.17% <0.00%> (-0.19%)	⬇️
x86_64-unknown-linux-gnu	70.17% <0.00%> (-0.19%)	⬇️
x86_64-unknown-linux-musl	70.46% <0.00%> (-0.19%)	⬇️

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