fix(rss): email and name were inverted in output and so uncompliant

[Guts]

Related to: #250
See: https://validator.w3.org/feed/docs/error/InvalidContact.html

Before:

<author>John Doe (John.Doe@example.com)</author>

After:

<author>John.Doe@example.com (John Doe)</author>

cc @stefansli

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.12%. Comparing base (7569e08) to head (1752ef1).
Report is 2 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@ ## main #343 +/- ## ======================================= Coverage 81.12% 81.12% ======================================= Files 11 11 Lines 747 747 Branches 125 125 ======================================= Hits 606 606 Misses 97 97 Partials 44 44 

Flag	Coverage Δ
unittests	81.12% <100.00%> (ø)

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Files with missing lines	Coverage Δ
..._plugin/integrations/theme_material_blog_plugin.py	77.35% <100.00%> (ø)