doc: Remove readthedocs mentions

Signed-off-by: Stéphane Graber <stgraber@stgraber.org>

doc/.readthedocs.yaml

@@ -1,31 +0,0 @@
-# .readthedocs.yaml
-# Read the Docs configuration file
-# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
-
-# Required
-version: 2
-
-# Set the version of Python and other tools you might need
-build:
-  os: ubuntu-22.04
-  tools:
-    golang: "1.18"
-    python: "3.11"
-  jobs:
-    pre_build:
-      - go build -o lxc.bin ./lxc
-
-# Build documentation in the docs/ directory with Sphinx
-sphinx:
-  builder: dirhtml
-  configuration: doc/conf.py
-  fail_on_warning: true
-
-# If using Sphinx, optionally build your docs in additional formats such as PDF
-formats:
-   - pdf
-
-# Optionally declare the Python requirements required to build your docs
-python:
-   install:
-   - requirements: doc/.sphinx/requirements.txt

doc/.sphinx/_static/custom.css

@@ -169,20 +169,6 @@ details summary {
     color: var(--color-link);
 }
 
-/** Fix the styling of the version box for readthedocs **/
-
-#furo-readthedocs-versions .rst-versions, #furo-readthedocs-versions .rst-current-version, #furo-readthedocs-versions:focus-within .rst-current-version, #furo-readthedocs-versions:hover .rst-current-version  {
-    background: var(--color-sidebar-item-background--hover);
-}
-
-.rst-versions .rst-other-versions dd a {
-    color: var(--color-link);
-}
-
-#furo-readthedocs-versions:focus-within .rst-current-version .fa-book, #furo-readthedocs-versions:hover .rst-current-version .fa-book, .rst-versions .rst-other-versions {
-    color: var(--color-sidebar-link-text);
-}
-
 .rst-versions .rst-current-version {
     color: var(--color-version-popup);
     font-weight: bolder;

doc/README.md

@@ -10,7 +10,7 @@ GitHub provides a basic rendering of the documentation as well, but important fe
 
 ### Documentation framework
 
-LXD's documentation is built with [Sphinx](https://www.sphinx-doc.org/en/master/index.html) and hosted on [Read the Docs](https://about.readthedocs.com/).
+LXD's documentation is built with [Sphinx](https://www.sphinx-doc.org/en/master/index.html).
 
 It is written in [Markdown](https://commonmark.org/) with [MyST](https://myst-parser.readthedocs.io/) extensions.
 For syntax help and guidelines, see the [documentation cheat sheet](https://documentation.ubuntu.com/lxd/en/latest/doc-cheat-sheet/) ([source](https://raw.githubusercontent.com/canonical/lxd/main/doc/doc-cheat-sheet.md)).