[REM] project: remove so_to_task.rst (#801)

These pages documented very straightforward screens and flows that a user can easily figure out without the help of dedicated documentation. Besides, those screens are frequently reworked, thus requiring to
maintain the related pages very closely. This commit removes such low values pages to reduce the technical debt and allow focusing on actually useful documentation pages.

project/advanced.rst

@@ -7,5 +7,4 @@ Advanced
 
    advanced/advanced_projects
    advanced/feedback
-   advanced/so_to_task
    advanced/profitability

project/advanced/so_to_task.rst

@@ -1,70 +0,0 @@
-===========================================
-Create Projects and Tasks from Sales Orders
-===========================================
-
-When you sell your services, you can choose to automatically have a project/task created, helping
-you to not lose track of the work that needs to get done, streamlining the processes between teams.
-In addition to that, you are able to invoice or reinvoice clients according to the exact time
-spent on that service.
-
-Product set up
-==============
-
-| Under :menuselection:`Sales --> Products --> Products` create a new product or set up an existing
-  one. Under *General Information* set the *Product Type* as *Service*. Under the *Sales* tab select
-  the *Service Invoicing Policy* and *Service Tracking*.
-| If you choose to:
-
-| - *Create a task in an existing project*: a task is added in the first column of the selected
-   project.
-| - *Create a task in sales order’s project*: a new project for each sales order of that service is
-   created based on the template you have chosen.
-| - *Create a new project but no task*: only creates a new project, for each time that service is
-   sold, based on the skeleton of the project template chosen.
-
-.. image:: media/sales_invoicing.png
-   :align: center
-   :alt: Choose the invoicing options on a product form under the sales tab in Odoo Project
-
-Confirm a quotation and have a project/task created
-===================================================
-
-Now, once a *Quotation* is confirmed and transformed into a *Sales Order*, a project or task
-is automatically created.
-
-.. image:: media/confirm_quotation.png
-   :align: center
-   :alt: Click on confirm in a quotation and have a task or project created for Odoo Project
-
-Access the task generated from Project
-======================================
-
-On the *Project* application, your new project and/or task (depending on the previous *Service
-Tracking* options chosen), is shown:
-
-.. image:: media/access_tasks.png
-   :align: center
-   :height: 250
-   :alt: Click on tasks in the dashboard view to access them in Odoo Project
-
-Record the time spent and create an invoice
-===========================================
-
-From *Project*, access your task and document the time spent under the *Timesheets* tab.
-
-.. image:: media/record_time.png
-   :align: center
-   :alt: Access the task and under the tab timesheet record the time spent in Odoo Project
-
-Once the task is complete, click on *Sales Order* and *Create Invoice*.
-
-.. image:: media/sales_order.png
-   :align: center
-   :alt: Click on sales order in the task once it is complete in Odoo Project
-
-.. tip::
-   To only invoice approved timesheets, go to :menuselection:`Timesheets --> Configuration -->
-   Settings`, and enable *Approved timesheets only*.
-
-.. seealso::
-    - :doc:`../../sales/invoicing/subscriptions`