Docs: formation energy beside the band structure in the graphene defect tutorial - #407

Changed pages include:

• index.html - view
• 404.html - view
• command-line/index.html - view
• developers/index.html - view
• guide/index.html - view
• interface/index.html - view
• reference/index.html - view
• resources/index.html - view
• standards/index.html - view
• accounts/balance/index.html - view

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