Moved Embedded Systems from Language Index to Subjects Index (#11004)

books/free-programming-books-langs.md

@@ -54,7 +54,6 @@ Books on general-purpose programming that don't focus on a specific language are
     * [Ecto](#ecto)
     * [Phoenix](#phoenix)
 * [Elm](#elm)
-* [Embedded Systems](#embedded-systems)
 * [Erlang](#erlang)
 * [F#](#f-sharp)
 * [Firefox OS](#firefox-os)
@@ -720,16 +719,6 @@ Books on general-purpose programming that don't focus on a specific language are
 * [Versioned APIs with Phoenix](https://web.archive.org/web/20210309052043/https://elviovicosa.com/freebies/versioned-apis-with-phoenix-by-elvio-vicosa.pdf) - Elvio Vicosa (PDF) *(:card_file_box: archived)*
 
 
-### Embedded Systems
-
-* [Control and Embedded Systems](http://www.learn-c.com) (HTML)
-* [Discovering the STM32 Microcontroller](http://www.cs.indiana.edu/~geobrown/book.pdf) (PDF)
-* [First Steps with Embedded Systems](https://www.phaedsys.com/principals/bytecraft/bytecraftdata/bcfirststeps.pdf) - Byte Craft Limited (PDF)
-* [Introduction to Embedded Systems, Second Edition](https://ptolemy.berkeley.edu/books/leeseshia/releases/LeeSeshia_DigitalV2_2.pdf) - Edward Ashford Lee, Sanjit Arunkumar Seshia (PDF)
-* [Introduction to Microcontrollers](http://www.embeddedrelated.com/showarticle/453.php) (HTML)
-* [Mastering the FreeRTOS Real Time Kernel - a Hands On Tutorial Guide](https://freertos.org/Documentation/RTOS_book.html) - freertos.org ([PDF](https://freertos.org/fr-content-src/uploads/2018/07/161204_Mastering_the_FreeRTOS_Real_Time_Kernel-A_Hands-On_Tutorial_Guide.pdf))
-
-
 ### Erlang
 
 * [BEAM Wisdoms](http://beam-wisdoms.clau.se/en/latest/) (HTML)

books/free-programming-books-subjects.md

@@ -20,6 +20,7 @@ Books that cover a specific programming language can be found in the [BY PROGRAM
 * [Containers](#containers)
 * [Data Science](#data-science)
 * [Database](#database)
+* [Embedded Systems](#embedded-systems)
 * [Game Development](#game-development)
 * [Graphical user interfaces](#graphical-user-interfaces)
 * [Graphics Programming](#graphics-programming)
@@ -296,6 +297,16 @@ Books that cover a specific programming language can be found in the [BY PROGRAM
 * [The Theory of Relational Databases](https://web.cecs.pdx.edu/~maier/TheoryBook/TRD.html)
 
 
+### Embedded Systems
+
+* [Control and Embedded Systems](http://www.learn-c.com) (HTML)
+* [Discovering the STM32 Microcontroller](http://www.cs.indiana.edu/~geobrown/book.pdf) (PDF)
+* [First Steps with Embedded Systems](https://www.phaedsys.com/principals/bytecraft/bytecraftdata/bcfirststeps.pdf) - Byte Craft Limited (PDF)
+* [Introduction to Embedded Systems, Second Edition](https://ptolemy.berkeley.edu/books/leeseshia/releases/LeeSeshia_DigitalV2_2.pdf) - Edward Ashford Lee, Sanjit Arunkumar Seshia (PDF)
+* [Introduction to Microcontrollers](http://www.embeddedrelated.com/showarticle/453.php) (HTML)
+* [Mastering the FreeRTOS Real Time Kernel - a Hands On Tutorial Guide](https://freertos.org/Documentation/RTOS_book.html) - freertos.org ([PDF](https://freertos.org/fr-content-src/uploads/2018/07/161204_Mastering_the_FreeRTOS_Real_Time_Kernel-A_Hands-On_Tutorial_Guide.pdf))
+
+
 ### Game Development
 
 * [2D Game Development: From Zero To Hero](https://github.com/Penaz91/2DGD_F0TH) - Daniele Penazzo (HTML, [PDF, EBPUB, Kindle...](https://therealpenaz91.itch.io/2dgd-f0th#download)) *(:construction: in process)*