Web interface experiment.

[azriel91]

Closes #125.

• Generate GraphViz dot diagram from Flow.
• Use tailwindcss to style GraphViz diagram.
• Add instructions for web development workflow.

If we use dioxus, then the cargo audit and licenses checks are pending a release (to pick up DioxusLabs/dioxus#1049), or we could use leptos.

[codecov]

Codecov Report

Patch coverage: 85.08% and project coverage change: -0.04 ⚠️

Comparison is base (794e2eb) 90.87% compared to head (1b1ce5a) 90.83%.

❗ Current head 1b1ce5a differs from pull request most recent head e12f13d. Consider uploading reports for the commit e12f13d to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #126      +/-   ##
==========================================
- Coverage   90.87%   90.83%   -0.04%     
==========================================
  Files         336      335       -1     
  Lines       30297    30403     +106     
==========================================
+ Hits        27532    27618      +86     
- Misses       2765     2785      +20     

Impacted Files	Coverage Δ
crate/cmd/src/scopes/single_profile_single_flow.rs	99.28% <ø> (ø)
crate/rt_model/src/flow.rs	40.90% <0.00%> (-28.33%)	⬇️
crate/rt_model/src/item_boxed.rs	72.72% <0.00%> (-11.49%)	⬇️
crate/rt_model/src/item_graph.rs	68.42% <0.00%> (-12.83%)	⬇️
crate/rt_model/src/item_graph_builder.rs	100.00% <ø> (ø)
items/sh_cmd/src/sh_cmd_executor.rs	44.73% <0.00%> (ø)
items/tar_x/src/tar_x_apply_fns.rs	75.00% <ø> (ø)
workspace_tests/src/peace_test_error.rs	50.00% <ø> (ø)
workspace_tests/src/rt/cmds/diff_cmd.rs	99.70% <ø> (ø)
...e_tests/src/rt/cmds/sub/states_desired_read_cmd.rs	98.66% <ø> (ø)
... and 12 more

... and 5 files with indirect coverage changes

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