Update guidemaker-elt, remove what was moved in the addon

[BlueCutOfficial]

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Update guidemaker-ember-locale-template (#208)

The addon has been published on NPM so we can now use the tag ^1.0.0. A few changes have been made to adapt the app:

• We removed table-of-contents component because its code has been moved in the addon directly
• We also removed the helper includes, which was moved in the addon too (because it's used in table-of-contents)
• We complete the environment config to configure the texts located directly in the hbs templates of the addon