doc: Temp revert of new theme

Temporarily revert new theme
as doc are not rendered in the Techdocs.

Signed-off-by: divya pillai <divya.pillai@nordicsemi.no>

Author: divipillai

docs/conf.py

@@ -26,11 +26,6 @@
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#options-for-html-output
 
 html_theme = 'sphinx_ncs_theme'
-html_show_sphinx = False
-html_static_path = ["_static"]
-html_css_files = ["hide-versions.css"]
-
-html_theme_options = {'docsets': {},"addons_url": "https://nrfconnect.github.io/ncs-app-index/","bare_metal_url": "","ncs_url": "https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/index.html", "ncs_label": "nRF Connect SDK Docs", "logo_url": "https://docs.nordicsemi.com"}
 
 # Include following files at the end of each .rst file.
 rst_epilog = """

docs/requirements.txt

@@ -1,6 +1,6 @@
 Sphinx==5.3.0
 breathe==4.35.0
-sphinx-ncs-theme<2.1
+sphinx-ncs-theme<1.1
 sphinx-tabs>=3.4
 sphinx-togglebutton>=0.3.2
 Pillow>=9.0.1