Rename roadmap -> roadmaps in docs

[sfmig]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?
For future-proofing, we decided to have in our docs a link to all our roadmaps (similar to brainglobe).

What does this PR do?

• Renames the title of the Roadmaps site to be in plural.
• Renames the .md file itself and the associated target variable for consistency.

References

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How has this PR been tested?

Tests pass locally and in CI, docs build locally.

Is this a breaking change?

\

Does this PR require an update to the documentation?

\

Checklist:

• The code has been tested locally
• [ n/a ] Tests have been added to cover all new functionality
• [ n/a ] The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.68%. Comparing base (b2de775) to head (a92460f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #188   +/-   ##
=======================================
  Coverage   99.68%   99.68%           
=======================================
  Files          11       11           
  Lines         638      638           
=======================================
  Hits          636      636           
  Misses          2        2           

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[niksirbi]

LGTM