Improve code spell check

Usage related changes

Improve after #443
Spelling check (installation and execution) is now a script in scripts/ which is used in .circleci/config.yml and can be used locally (e.g. in pre-commit)
Add .git/hooks/pre-commit notice to README.md

[x] Checked the relevant parts of development docs
[x] Applied formatting - ./scripts/format.sh
[x] No linter errors - ./scripts/clippy_check.sh
[x] No unused dependencies - ./scripts/check_unused_deps.sh
[x] Performed code self-review
[x] Rebased to the latest commit of the target branch (or merged it into my branch)
[x] Updated the docs if needed, including the TODO section
[x] Linked the issues which this PR resolves
[x] Updated the tests if needed; all passing (execution info)