Add isort to the pre-commit configuration and apply it to the whole project (#595)

* Apply isort to the entire repository
* Fix missing import issues in text_to_entries
* Fix imports in migration files

tests/test_text_search.py

@@ -4,14 +4,11 @@ import logging
 import os
 from pathlib import Path
 
-# External Packages
 import pytest
 
 from khoj.database.models import Entry, GithubConfig, KhojUser, LocalOrgConfig
 from khoj.processor.content.github.github_to_entries import GithubToEntries
 from khoj.processor.content.org_mode.org_to_entries import OrgToEntries
-
-# Internal Packages
 from khoj.search_type import text_search
 from khoj.utils.fs_syncer import collect_files, get_org_files
 from khoj.utils.rawconfig import ContentConfig, SearchConfig