docs(readthedocs): removed old leftover readthedocs references

.gitlab/CODEOWNERS

@@ -54,7 +54,6 @@
 /.idf_build_apps.toml                 @esp-idf-codeowners/ci
 /.idf_ci.toml                         @esp-idf-codeowners/ci
 /.pre-commit-config.yaml              @esp-idf-codeowners/ci
-/.readthedocs.yml                     @esp-idf-codeowners/docs
 /.vale.ini                            @esp-idf-codeowners/docs
 /CMakeLists.txt                       @esp-idf-codeowners/build-config
 /COMPATIBILITY*.md                    @esp-idf-codeowners/peripherals

.readthedocs.yml

@@ -1,21 +0,0 @@
-# .readthedocs.yml
-# Read the Docs configuration file
-# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
-
-# Required
-version: 2
-
-# Optionally build your docs in additional formats such as PDF and ePub
-formats:
-  - pdf
-
-# Optionally set the version of Python and requirements required to build your docs
-python:
-  version: 2.7
-  install:
-    - requirements: docs/requirements.txt
-
-# We need to list all the submodules included in documentation build by Doxygen
-submodules:
-  include:
-    - components/mqtt/esp-mqtt

docs/en/resources.rst

@@ -30,5 +30,3 @@ Useful Links
 * If you're interested in contributing to ESP-IDF, please check the :doc:`contribute/index`.
 
 * For additional {IDF_TARGET_NAME} product related information, please refer to `documentation <https://espressif.com/en/support/download/documents>`_ section of `Espressif <https://espressif.com/en/support/download/documents>`__ site.
-
-* `Download <https://readthedocs.com/projects/espressif-esp-idf/downloads/>`_ latest and previous versions of this documentation in PDF and HTML format.

docs/zh_CN/resources.rst

@@ -30,5 +30,3 @@
 * 如果你有兴趣参与到 ESP-IDF 的开发, 请查阅 :doc:`contribute/index`。
 
 * 关于 {IDF_TARGET_NAME} 的其它信息，请查看官网 `文档 <https://espressif.com/zh-hans/support/download/documents>`_ 版块。
-
-* 关于本文档的 PDF 和 HTML 格式下载（最新版本和早期版本），请点击 `下载 <https://readthedocs.com/projects/espressif-esp-idf/downloads/>`_。