feat: add logo and header to mail templates

[arturlg]

Closes #2059
Closes #2060
Closes #2086
Closes #2105

[github-actions]

🎉 Deployment for commit c50e65b :

Ingresses

• 🚀 https://egapro-feat-addmailheadertemplate-47mgzchy.dev.fabrique.social.gouv.fr/
• 🚀 https://egapro-feat-addmailheadertemplate-47mgzchy.dev.fabrique.social.gouv.fr/api(/|$)(.*)
• 🚀 https://egapro-feat-addmailheadertemplate-47mgzchy.dev.fabrique.social.gouv.fr/api/auth(/|$)(.*)
• 🚀 https://egapro-feat-addmailheadertemplate-47mgzchy.dev.fabrique.social.gouv.fr/dgt-export-representation.xlsx
• 🚀 https://egapro-feat-addmailheadertemplate-47mgzchy.dev.fabrique.social.gouv.fr/dgt-representation.xlsx
• 🚀 https://egapro-feat-addmailheadertemplate-47mgzchy.dev.fabrique.social.gouv.fr/dgt.xlsx
• 🚀 https://egapro-feat-addmailheadertemplate-47mgzchy.dev.fabrique.social.gouv.fr/full.ndjson
• 🚀 https://egapro-feat-addmailheadertemplate-47mgzchy.dev.fabrique.social.gouv.fr/index-egalite-fh.xlsx
• 🚀 https://egapro-feat-addmailheadertemplate-47mgzchy.dev.fabrique.social.gouv.fr/index-egapro/recherche(/|$)(.*)
• 🚀 https://egapro-feat-addmailheadertemplate-47mgzchy.dev.fabrique.social.gouv.fr/indexes.csv
• 🚀 https://maildev-egapro-feat-addmailheadertemplate-47mgzchy.dev.fabrique.social.gouv.fr/
• 🚀 https://pgweb-egapro-feat-addmailheadertemplate-47mgzchy.dev.fabrique.social.gouv.fr/

Docker images

• 📦 docker pull ghcr.io/socialgouv/docker/nginx:7.0.1
• 📦 docker pull harbor.fabrique.social.gouv.fr/egapro/egapro/api:sha-c50e65baa5b488c51e6b8b6e54874abe2a808188
• 📦 docker pull harbor.fabrique.social.gouv.fr/egapro/egapro/app:sha-c50e65baa5b488c51e6b8b6e54874abe2a808188
• 📦 docker pull harbor.fabrique.social.gouv.fr/egapro/egapro/nginx:sha-c50e65baa5b488c51e6b8b6e54874abe2a808188
• 📦 docker pull maildev/maildev:2.1.0
• 📦 docker pull sosedoff/pgweb:0.14.1

Debug

• 📕 Loki logs for namespace egapro-feat-addmailheadertemplate-47mgzchy
• 📈 Pods monitoring for namespace egapro-feat-addmailheadertemplate-47mgzchy
• 📈 Workloads monitoring for namespace egapro-feat-addmailheadertemplate-47mgzchy

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[SocialGroovyBot]

🎉 This PR is included in version 3.2.0 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀