refactor: group Python examples as <lang>/<framework>/<database>

Author: php-coder

README.md

@@ -49,7 +49,7 @@ Generates the endpoints (or a whole app) from a mapping (SQL query -> URL)
    | -----------| ----------------------------| ---------------------------| --------- |
    | JavaScript | `npx query2app --lang js`   | [`app.js`](examples/js/app.js)<br/>[`routes.js`](examples/js/routes.js)<br/>[`package.json`](examples/js/package.json) | Web: [`express`](https://www.npmjs.com/package/express), [`body-parser`](https://www.npmjs.com/package/body-parser)<br>Database: [`mysql`](https://www.npmjs.com/package/mysql) |
    | Golang     | `npx query2app --lang go`   | [`app.go`](examples/go/chi/mysql/app.go)<br/>[`routes.go`](examples/go/chi/mysql/routes.go)<br/>[`go.mod`](examples/go/chi/mysql/go.mod) | Web: [`go-chi/chi`](https://github.com/go-chi/chi)<br/>Database: [`go-sql-driver/mysql`](https://github.com/go-sql-driver/mysql), [`jmoiron/sqlx`](https://github.com/jmoiron/sqlx) |
-   | Python     | `npx query2app --lang python` | [`app.py`](examples/python/app.py)<br/>[`db.py`](examples/python/db.py)<br/>[`routes.py`](examples/python/routes.py)<br/>[`requirements.txt`](examples/python/requirements.txt) | Web: [FastAPI](https://github.com/tiangolo/fastapi), [Uvicorn](https://www.uvicorn.org)<br/>Database: [psycopg2](https://pypi.org/project/psycopg2/) |
+   | Python     | `npx query2app --lang python` | [`app.py`](examples/python/fastapi/postgres/app.py)<br/>[`db.py`](examples/python/fastapi/postgres/db.py)<br/>[`routes.py`](examples/python/fastapi/postgres/routes.py)<br/>[`requirements.txt`](examples/python/fastapi/postgres/requirements.txt) | Web: [FastAPI](https://github.com/tiangolo/fastapi), [Uvicorn](https://www.uvicorn.org)<br/>Database: [psycopg2](https://pypi.org/project/psycopg2/) |
 
 1. Run the application
    | Language   | Commands to run the application |

examples/python/endpoints.yaml

@@ -0,0 +1 @@
+../../../js/endpoints.yaml

examples/python/app.py renamed to examples/python/fastapi/postgres/app.py

@@ -30,7 +30,7 @@
     "test": "echo \"Error: no test specified\" && exit 1",
     "gen-js-example": "cd examples/js; ../../src/cli.js --lang js",
     "gen-go-example": "cd examples/go/chi/mysql; ../../../../src/cli.js --lang go",
-    "gen-py-example": "cd examples/python; ../../src/cli.js --lang python"
+    "gen-py-example": "cd examples/python/fastapi/postgres; ../../../../src/cli.js --lang python"
   },
   "dependencies": {
     "ejs": "~3.1.9",