use default theme on RTD #1255

	name: Generate Grants
	on:
	push:
	branches:
	- master
	schedule:
	- cron: "0 4 * * *"
	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Set up Python 3.11
	uses: actions/setup-python@v4
	with:
	python-version: "3.11"
	- name: Install dependencies
	run: python -m pip install -r requirements.txt
	- name: Generate the list of grants
	run: python _scripts/generate_grants.py > ./operations/grants.rst
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	- name: Create PR
	uses: peter-evans/create-pull-request@v3
	with:
	token: ${{ secrets.GITHUB_TOKEN }}
	commit-message: "update the list of grants (generated)"
	branch: automation/grants
	title: "Automated update of the list of grants"
	body: >
	Automated update of the list of grants :robot:
	For details, see [the docs](https://docs.pyvec.org/CONTRIBUTING.html#skript-na-generovani-zapisu-hlasovani-o-grantech) :book:

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