no-op, rename files to make space for 04_plugin_sidebar

diff --git a/_manual/11_working-with-plugins/04_windows-vst-support.html b/_manual/11_working-with-plugins/05_windows-vst-support.html
similarity index 100%
rename from _manual/11_working-with-plugins/04_windows-vst-support.html
rename to _manual/11_working-with-plugins/05_windows-vst-support.html

diff --git a/_manual/11_working-with-plugins/05_working-with-ardour-built-plugin-editors.html b/_manual/11_working-with-plugins/06_working-with-ardour-built-plugin-editors.html
similarity index 100%
rename from _manual/11_working-with-plugins/05_working-with-ardour-built-plugin-editors.html
rename to _manual/11_working-with-plugins/06_working-with-ardour-built-plugin-editors.html

diff --git a/_manual/11_working-with-plugins/06_getting-plugins.html b/_manual/11_working-with-plugins/07_getting-plugins.html
similarity index 100%
rename from _manual/11_working-with-plugins/06_getting-plugins.html
rename to _manual/11_working-with-plugins/07_getting-plugins.html