Archive unmaintained servers

Removed the following servers from main branch:
- aws-kb-retrieval-server
- brave-search
- everart
- gdrive
- git
- github
- gitlab
- google-maps
- postgres
- puppeteer
- redis
- sentry
- slack
- sqlite

These servers remain maintained:
- sequentialthinking
- time
- memory
- fetch
- filesystem
- everything

Full history preserved in archive-servers branch

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/git/tests/test_server.py

@@ -1,30 +0,0 @@
-import pytest
-from pathlib import Path
-import git
-from mcp_server_git.server import git_checkout
-import shutil
-
-@pytest.fixture
-def test_repository(tmp_path: Path):
-    repo_path = tmp_path / "temp_test_repo"
-    test_repo = git.Repo.init(repo_path)
-
-    Path(repo_path / "test.txt").write_text("test")
-    test_repo.index.add(["test.txt"])
-    test_repo.index.commit("initial commit")
-
-    yield test_repo
-
-    shutil.rmtree(repo_path)
-
-def test_git_checkout_existing_branch(test_repository):
-    test_repository.git.branch("test-branch")
-    result = git_checkout(test_repository, "test-branch")
-
-    assert "Switched to branch 'test-branch'" in result
-    assert test_repository.active_branch.name == "test-branch"
-
-def test_git_checkout_nonexistent_branch(test_repository):
-
-    with pytest.raises(git.GitCommandError):
-        git_checkout(test_repository, "nonexistent-branch")