Remove outdated SBC info and references to it

* Remove outdated section on SBCs as an affordable option (prices are high as of 2026)

* Remove references to SBC section

Author: pushfoo

doc/about/for_academia.rst

@@ -100,68 +100,3 @@ unless at least one of the following is true:
 * It is required for a security or compatibilty improvement
 * The effort required is minimal
 
-
-Raspberry Pi and other SBCs
----------------------------
-
-For educators, Single-Board Computers (SBCs) such as the Raspberry Pi 4 and 5
-are not always the most cost-effective option.
-
-However, they may be an attractive option when at least one of the following
-applies:
-
-* You have an educational discount
-* You have grant or non-profit funding
-* Surplus hardware isn't an option
-
-
-.. _sbc_rule_of_thumb:
-
-SBC Purchasing Rules of Thumb
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-.. note:: These rules help **non-experts** steer toward Arcade-compatible devices.
-
-          You can find more in-depth descriptions of the required OpenGL ES versions
-          and more under the :ref:`sbc_requirements` heading.
-
-
-ARM64 and AMD64 are Easiest
-"""""""""""""""""""""""""""
-
-The :ref:`known-working Raspberry Pi 4 and 5 <sbc_supported_raspi>` are both ARM64
-devices. If you are considering other boards due to price or availability, stick to
-the following CPU architectures:
-
-* ARM64
-* AMD64 (same as most non-Mac desktop CPUs)
-
-No RISC-based SBC has been verified as compatible. Although some *may* work,
-SBCs based on RISC-V CPUs are likely to lack:
-
-* introductory tutorials
-* beginner-friendly documentation 
-
-
-Credit Card Rule
-""""""""""""""""
-
-As of October 2024, all compatible and widely-available SBCs are
-larger than credit cards:
-
-* 3.375 inches by 2.125 inches
-* 85.60 mm by 53.98 mm
-
-If you try to use this rule:
-
-#. Compare to the actual circuit board's size, not the size of the package
-#. Use an old hotel key card, expired credit card, or expired debit card
-
-It's unlikey that an SBC board will have magnets. However, the package
-might include them in motors (in kits) or as part of the box itself.
-Using an old card stops you from accidentally wiping a magnetic strip you need.
-
-Although this errs on the side of caution, it also:
-
-* quickly rules out :ref:`incompatible Raspberry Pi models <sbc_unsupported_raspis>`
-* should apply to other SBCs as well

doc/programming_guide/gles_raspi_and_sbc.rst

@@ -110,9 +110,7 @@ The table below lists these newer incompatible Raspberry Pi devices.
 SBC Requirements
 ----------------
 Any Single Board Computer (SBC) which meets the following
-requirements may work. If you are a parent or educator shopping for a
-compatible SBC, please see the :ref:`sbc_rule_of_thumb`.
-
+requirements may work.
 
 Standard Python
 ^^^^^^^^^^^^^^^