feat:api Rename overwritreSessionsSpeakers route and remove required icon on speaker social

[HugoGresse]

• change overwriteSessionsSpeakers route and file names to sessions-speakers

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit e7429d3):

• https://conferencecenterr--pr145-rename-overwritesess-mk6jvpzm.web.app
• https://apiopenplanner--pr145-rename-overwritesess-jg3vo8qy.web.app

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