Updated the link to Cadence documentation pages in Examples.tsx

[pranav-kural]

Description

Updated the link to Cadence documentation pages in Examples.tsx

Cadence-lang.org seems to have changed the URL for these documentation pages.

For example: https://cadence-lang.org/docs/tutorial/01-first-steps

Has been changed to: https://cadence-lang.org/docs/tutorial/first-steps

Therefore, links to the Cadence docs present in the Example.tsx needed to be updated.

Have removed the numerical part from all the links and confirmed they are working.

[bthaile]

Thank, we moved the playground tutorials to cadence-lang.org. developer portal is redirecting.