feat: define scroll speed + smart_send to qflist (#610)

* smart send to qflist

* Previewer scrolling for half window height

* Start doing cleanup in readme

* feat: add ability to define the scrolling speed

* move scrolling action to action.set

* docs: added more docs for actions

* [docgen] Update doc/telescope.txt
skip-checks: true

Co-authored-by: Simon Hauser <Simon-Hauser@outlook.de>
Co-authored-by: Github Actions <actions@github>

doc/telescope.txt

@@ -180,6 +180,11 @@ actions.move_to_top({prompt_bufnr})                    *actions.move_to_top()*
         {prompt_bufnr} (number)  The prompt bufnr
 
 
+actions.open_qflist()                                  *actions.open_qflist()*
+    Open the quickfix list
+
+
+
 actions.remove_selection({prompt_bufnr})          *actions.remove_selection()*
     Remove current entry from multi select
 
@@ -516,6 +521,9 @@ horizontal and vertical layouts):
   - preview_width:
     - Change the width of Telescope's preview window
 
+  - scroll_speed:
+    - Change the scrolling speed of the previewer
+
 layout_strategies.center()                        *layout_strategies.center()*
     Centered layout wih smaller default sizes (I think)