Add additional free programming books (HTML, CSS, terminology) (#11242)

* feat: add additional free programming books

Added multiple new entries to the free programming books repository. These include resources on HTML, CSS, and web development by Jens Oliver Meiert, among others.

(This commit message was AI-generated.)

Signed-off-by: Jens Oliver Meiert <jens@meiert.com>

* fix: update link for 'Rote Learning HTML & CSS'

Corrected the URL for 'Rote Learning HTML & CSS' to the English version of the page. This ensures users are directed to the appropriate content without encountering a language barrier.

(This commit message was AI-generated.)

Signed-off-by: Jens Oliver Meiert <jens@meiert.com>

---------

Signed-off-by: Jens Oliver Meiert <jens@meiert.com>

books/free-programming-books-de.md

@@ -120,6 +120,7 @@
 ### HTML and CSS
 
 * [CSS](http://www.peterkropff.de/site/css/css.htm) - Peter Kropff (Grundlagen, OOP, MySQLi, PDO) (Online, PDF)
+* [Das kleine Buch der HTML-/CSS-Frameworks](https://github.com/frontenddogma/html-css-frameworks) – Jens Oliver Meiert
 * [HTML](http://www.peterkropff.de/site/html/html.htm) - Peter Kropff (Online, PDF)
 * [HTML5-Handbuch](http://webkompetenz.wikidot.com/docs:html-handbuch) (Online)
 * [Self HTML](https://wiki.selfhtml.org/wiki/Startseite) (Online)

books/free-programming-books-langs.md

@@ -941,6 +941,7 @@ Books on general-purpose programming that don't focus on a specific language are
 * [Code Guide: Standards for developing flexible, durable, and sustainable HTML and CSS](http://mdo.github.io/code-guide/) - Mark Otto
 * [CSS Animation 101](https://github.com/cssanimation/css-animation-101)
 * [CSS Notes for Professionals](http://goalkicker.com/CSSBook) - Compiled from StackOverflow Documentation (PDF)
+* [CSS Optimization Basics](https://github.com/frontenddogma/css-optimization-basics) – Jens Oliver Meiert
 * [CSS Transition vs CSS animation](https://www.freecodecamp.org/news/css-transition-vs-css-animation-handbook/) - Oluwatobi Sofela
 * [Dive Into HTML5](http://diveinto.html5doctor.com) - Mark Pilgrim ([PDF](http://mislav.net/2011/10/dive-into-html5/))
 * [DOM Enlightenment](http://domenlightenment.com) - Cody Lindley (HTML)
@@ -971,12 +972,14 @@ Books on general-purpose programming that don't focus on a specific language are
 * [Practical Series: A website template](https://practicalseries.com/1001-webdevelopment/) - Michael Gledhill (HTML)
 * [Pro HTML5 Programming](https://web.archive.org/web/20181215200026/http://apress.jensimmons.com/v5/pro-html5-programming/ch0.html) - Jen Simmons, Chris O'Connor, Dylan Wooters, Peter Lubbers *(:card_file_box: archived)*
 * [Resilient Web Design](https://resilientwebdesign.com/#Resilientweb%20design) - Jeremy Keith
+* [Rote Learning HTML & CSS](https://meiert.com/en/blog/rote-learning-html-and-css/) – Jens Oliver Meiert
 * [RTL Styling 101](https://rtlstyling.com) - Ahmad Shadeed
 * [Scalable and Modular Architecture for CSS](https://web.archive.org/web/20191116073929/http://smacss.com/) - Jonathan Snook *(:card_file_box: archived)*
 * [The CSS Flexbox Handbook](https://www.freecodecamp.org/news/the-css-flexbox-handbook/) - Benjamin Semah
 * [The CSS Handbook](https://flaviocopes.com/page/css-handbook/) - Flavio Copes (PDF, EPUB, Kindle) *(email address requested)*
 * [The HTML Handbook](https://flaviocopes.com/page/html-handbook/) - Flavio Copes (PDF, EPUB, Kindle) *(email address requested)*
 * [Understanding Flexbox: Everything you need to know](https://ohansemmanuel.github.io/uf_download.html) - Ohans Emmanuel
+* [Upgrade Your HTML](https://github.com/frontenddogma/upgrade-your-html) – Jens Oliver Meiert
 * [W3.CSS Succinctly](https://www.syncfusion.com/ebooks/w3_css_succinctly) - Joseph D. Booth
 * [Web Audio API](http://chimera.labs.oreilly.com/books/1234000001552) - Boris Smus
 * [Web Visual Effects with CSS3](https://leanpub.com/web-visual-effects-with-css3/read) - Thomas Mak

books/free-programming-books-subjects.md

@@ -656,6 +656,7 @@ Books that cover a specific programming language can be found in the [BY PROGRAM
 * [Signal Computing: Digital Signals in the Software Domain](http://faculty.washington.edu/stiber/pubs/Signal-Computing/Signal%20Computing.pdf) - Michael Stiber, Bilin Zhang Stiber, Eric C. Larson (PDF)
 * [Small Memory Software](https://smallmemory.charlesweir.com/book.html) - Charles Weir, James Noble (HTML)
 * [Software Technical Writing: A Guidebook](https://jamesg.blog/book.pdf) - James Gallagher (PDF)
+* [The Web Development Glossary](https://github.com/frontenddogma/web-development-glossary) – Jens Oliver Meiert
 * [Web Almanac](https://almanac.httparchive.org/static/pdfs/web_almanac_2019_en.pdf) (PDF)
 * [Writing Native Mobile Apps in a Functional Language Succinctly](https://www.syncfusion.com/ebooks/writing_native_mobile_apps_in_a_functional_language_succinctly) - Vassili Kaplan