fix: correct doc links in README (replace .html with trailing slash)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: mbaronnet

README.MD

@@ -62,12 +62,12 @@ Install EPM and choose how you want to run it:
 
 | Method | Best for |
 |--------|----------|
-| [Windows Installer](https://esmap-world-bank-group.github.io/EPM/run/run_installation.html) | One-click setup on Windows — installs everything automatically |
-| [Dashboard](https://esmap-world-bank-group.github.io/EPM/run/run_dashboard.html) | Visual interface for quick runs, no command line needed *(under development)* |
-| [Python CLI](https://esmap-world-bank-group.github.io/EPM/run/run_python.html) | Scenarios, automation, Monte Carlo |
-| [GAMS Studio](https://esmap-world-bank-group.github.io/EPM/run/run_gams_studio.html) | Model development and GAMS debugging |
+| [Windows Installer](https://esmap-world-bank-group.github.io/EPM/run/run_installation/) | One-click setup on Windows — installs everything automatically |
+| [Dashboard](https://esmap-world-bank-group.github.io/EPM/run/run_dashboard/) | Visual interface for quick runs, no command line needed *(under development)* |
+| [Python CLI](https://esmap-world-bank-group.github.io/EPM/run/run_python/) | Scenarios, automation, Monte Carlo |
+| [GAMS Studio](https://esmap-world-bank-group.github.io/EPM/run/run_gams_studio/) | Model development and GAMS debugging |
 
-Full installation instructions are available [here](https://esmap-world-bank-group.github.io/EPM/run/run_installation.html).
+Full installation instructions are available [here](https://esmap-world-bank-group.github.io/EPM/run/run_installation/).
 
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