doc/manual: Drop LaTeX style guide

LaTeX is not used for the documentation but only as (intermediate)
output format. Developers do not need to write any LaTeX code at all and
will not need to do so in the future, so we do not need a style guide.

Remove the section on LaTeX from the style guide to make it clearer and
avoid confusion.

Change-Id: I238a35445616f39e38104ad0ff50ab246dd5990f
Signed-off-by: Marc Schink <dev@zapb.de>
Reviewed-on: https://review.openocd.org/c/openocd/+/9110
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

doc/manual/primer/docs.txt

@@ -16,7 +16,6 @@ OpenOCD presently produces several kinds of documentation:
   - Provides overview, usage, reference, and FAQ for each device.
   - Written using LaTeX language with custom macros.
   - Created with 'make references'.
-  - See @subpage primerlatex and @ref stylelatex.
 - The Manual:
   - Focuses on developing the OpenOCD software.
   - Details the architecture, driver interfaces, and processes.
@@ -44,19 +43,6 @@ the Texinfo web site for the Texinfo manual and more information.
 OpenOCD style guidelines for Texinfo documentation can be found on the
 @ref styletexinfo page.
 
- */
-/** @page primerlatex LaTeX Primer
-
-The OpenOCD project provides a number of reference guides using the
-LaTeX typesetting language.
-
-- OpenOCD Quick Reference Sheets
-- OpenOCD Hardware Reference Guides
-
-These documents have not yet been produced, so this Primer serves as
-a placeholder to describe how they are created and can be extended.
-The same holds true for the @ref stylelatex page.
-
  */
 /** @page primerdoxygen Doxygen Primer
 
@@ -118,7 +104,6 @@ This file contains the Doxygen source code for the @ref primerdocs.
 The @ref primerdocs page also contains the following sections:
 
 - @ref primertexinfo
-- @ref primerlatex
 - @ref primerdoxygen
 
  */