add Features on index

Can we load feature text from .md or .yml ?

• add Froggit Features section on index
• add Features link on header

Features list are here : https://lydra.systeme.io/froggit-beta-inscription

Inspiration:

• https://github.com/kamilkisiela/graphql-inspector
• https://graphql-inspector.com/
• https://the-guild.dev/services

moved from gatsby_froggit.fr#18 (moved)

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changed title from add functions on index to add Features on index

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assigned to @HuguesGouttebroze

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created merge request !11 (merged) to address this issue

mentioned in merge request !11 (merged)

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marked the checklist item add Froggit Features section on index as completed

marked the checklist item add Features link on header as completed

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closed with merge request !11 (merged)

mentioned in commit 2a0e4185