Fix link to Simorgh repo in first paragraph

[jfix]

Without the https:// the effective link was https://github.com/bbc/psammead/blob/latest/www.github.com/bbc/simorgh

Resolves #NUMBER

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Code changes:

• A bullet point list of key code changes that have been made.
• When describing code changes, try to communicate how and why you implemented something a specific way, not just what has changed.

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• (BBC contributors only) This PR follows the repository use guidelines
• I have assigned myself to this PR and the corresponding issues
• Automated jest tests added (for new features) or updated (for existing features)
• This PR requires manual testing