docs: fix links and some headings (#380)

I broke some links in #378, so this update fixes them. Additionally,
there are some cosmetic changes, such as updating the titles to the
correct case format.

Author: vdusek

docs/01_overview/01_introduction.mdx

@@ -1,6 +1,6 @@
 ---
+id: introduction
 title: Introduction
-sidebar_label: Introduction
 ---
 
 import CodeBlock from '@theme/CodeBlock';
@@ -21,34 +21,34 @@ Actors can be executed locally or on the [Apify platform](https://docs.apify.com
 
 If you're new to Apify, refer to the Apify platform documentation to learn [what Apify is](https://docs.apify.com/platform/about).
 
-## Quick Start
+## Quick start
 
 This section provides a quick start guide for creating and running Actors.
 
 ### Creating Actors
 
-To create and run Actors using the Apify Console, see the [Console documentation](https://docs.apify.com/academy/getting-started/creating-actors#choose-your-template).
+To create and run Actors using the Apify Console, see the [Console documentation](https://docs.apify.com/platform/console).
 
-For creating and running Python Actors locally, refer to the documentation for [creating and running Python Actors locally](./running_locally).
+For creating and running Python Actors locally, refer to the documentation for [creating and running Python Actors locally](./running-actors-locally).
 
 ### Guides
 
 Integrate the Apify SDK with popular web scraping libraries by following these guides:
-- [Requests or HTTPX](../guides/requests_and_httpx)
-- [Beautiful Soup](../guides/beautiful_soup)
+- [BeautifulSoup with HTTPX](../guides/beautifulsoup-httpx)
+- [Crawlee](../guides/crawlee)
 - [Playwright](../guides/playwright)
 - [Selenium](../guides/selenium)
 - [Scrapy](../guides/scrapy)
 
-### Usage Concepts
+### Usage concepts
 
 For a deeper understanding of the Apify SDK's features, refer to the **Usage concepts** section in the sidebar. Key topics include:
 - [Actor lifecycle](../concepts/actor-lifecycle)
 - [Working with storages](../concepts/storages)
 - [Handling Actor events](../concepts/actor-events)
 - [Using proxies](../concepts/proxy-management)
 
-## Installing the Apify SDK Separately
+## Installing the Apify SDK separately
 
 When creating an Actor using the Apify CLI, the Apify SDK for Python is installed automatically. If you want to install it independently, use the following command:
 

docs/01_overview/02_running_actors_locally.mdx

@@ -1,6 +1,6 @@
 ---
-title: Running Actor locally
-sidebar_label: Running Actors locally
+id: running-actors-locally
+title: Running Actors locally
 ---
 
 import Tabs from '@theme/Tabs';

docs/01_overview/03_actor_structure.mdx

@@ -1,6 +1,6 @@
 ---
+id: actor-structure
 title: Actor structure
-sidebar_label: Actor structure
 ---
 
 import CodeBlock from '@theme/CodeBlock';
@@ -17,7 +17,7 @@ The `.actor/` directory contains the [Actor configuration](https://docs.apify.co
 The Actor's runtime dependencies are specified in the `requirements.txt` file,
 which follows the [standard requirements file format](https://pip.pypa.io/en/stable/reference/requirements-file-format/).
 
-The Actor's source code is in the `src/` folder. This folder contains two important files: `main.py`, which contains the main function of the Actor, and `__main__.py`, which is the entrypoint of the Actor package, setting up the Actor [logger](../concepts/logging) and executing the Actor's main function via [`asyncio.run()`](https://docs.python.org/3/library/asyncio-runner.html#asyncio.run).
+The Actor's source code is in the `src/` folder. This folder contains two important files: `main.py`, which contains the main function of the Actor, and `__main__.py`, which is the entrypoint of the Actor package, setting up the Actor [logger](../concepts/logging) and executing the Actor's main function via [`asyncio.run`](https://docs.python.org/3/library/asyncio-runner.html#asyncio.run).
 
 <Tabs>
     <TabItem value="main.py" label="main.py" default>

docs/02_guides/01_beautifulsoup_httpx.mdx

@@ -1,6 +1,6 @@
 ---
+id: beautifulsoup-httpx
 title: Using BeautifulSoup with HTTPX
-sidebar_label: Using BeautifulSoup with HTTPX
 ---
 
 import CodeBlock from '@theme/CodeBlock';

docs/02_guides/02_crawlee.mdx

@@ -1,6 +1,6 @@
 ---
+id: crawlee
 title: Using Crawlee
-sidebar_label: Using Crawlee
 ---
 
 import CodeBlock from '@theme/CodeBlock';

docs/02_guides/03_playwright.mdx

@@ -1,6 +1,6 @@
 ---
+id: playwright
 title: Using Playwright
-sidebar_label: Using Playwright
 ---
 
 import Tabs from '@theme/Tabs';

docs/02_guides/04_selenium.mdx

@@ -1,6 +1,6 @@
 ---
+id: selenium
 title: Using Selenium
-sidebar_label: Using Selenium
 ---
 
 import CodeBlock from '@theme/CodeBlock';

docs/02_guides/05_scrapy.mdx

@@ -1,6 +1,6 @@
 ---
+id: scrapy
 title: Using Scrapy
-sidebar_label: Using Scrapy
 ---
 
 import CodeBlock from '@theme/CodeBlock';

docs/03_concepts/01_actor_lifecycle.mdx

@@ -1,6 +1,6 @@
 ---
+id: actor-lifecycle
 title: Actor lifecycle
-sidebar_label: Actor lifecycle
 ---
 
 import CodeBlock from '@theme/CodeBlock';

docs/03_concepts/02_actor_input.mdx

@@ -1,6 +1,6 @@
 ---
+id: actor-input
 title: Actor input
-sidebar_label: Actor input
 ---
 
 import CodeBlock from '@theme/CodeBlock';