[docs/style/fix] changes on flowcharts

[AgostinoPurificato]

Pre:

• flowcharts are not correctly rendered on firefox browser
• colors used are not aligned with the national palette
• somewhere the text into the boxes is not aligned with the text in the guide
• there is no explicit reference between the two diagrams

Post:

• flowcharts are now correctly rendered on firefox
• colors are aligned with the national palette
• the text in the boxes is now aligned with guide
• there is an explicit reference between the two diagrams

some screenshots...

CC: @Clou-dia @mauropratesi

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Name	Status	Preview	Updated (UTC)
dati-semantic-guida-ndc-docs	✅ Ready (Inspect)	Visit Preview	Sep 3, 2024 1:31pm