Update the filenames in the files linking to other files (#221)

* Update the filenames in the files linking to other files

* Add .md because it's needed

docs/api.md

@@ -2,7 +2,7 @@
 
 ### Language
 
-All endpoints that return a JSON body support `&hl=LANGUAGE` for translating fields into the desired language. A list of languages are provided in [List of URL parameters](./List-of-URL-parameters).
+All endpoints that return a JSON body support `&hl=LANGUAGE` for translating fields into the desired language. A list of languages are provided in [List of URL parameters](./url-parameters.md).
 
 ### Pretty
 

docs/db-maintenance.md

@@ -2,7 +2,7 @@
 
 Invidious needs one PostgreSQL database which has the following tables.
 
-- `annotations` Caches annotation data if `cache_annotations` is enabled in [`config.yml`](./Configuration)
+- `annotations` Caches annotation data if `cache_annotations` is enabled in [`config.yml`](./configuration.md)
 - `channel_videos` Stores truncated video info, used to create user feeds
 - `channels` Stores UCID and author name
 - `nonces` Keeps track of tokens issued to prevent CSRF

docs/index.md

@@ -1,25 +1,25 @@
 ## General
 
-- [Public Invidious Instances](./Invidious-Instances.md)
-- [Extensions](./Extensions.md)
-- [Always proxy videos through server](./Always-use-"local"-to-proxy-video-through-the-server-without-creating-an-account.md)
-- [Preferences](./Preferences.md)
-- [Geoblocking, available quality and DASH](./Geoblocking,-available-video-quality-and-DASH.md)
-- [Using search operators](./Search-operators.md)
-- [List of URL parameters](./List-of-URL-parameters.md)
-- [How to deal with uMatrix](./How-to-deal-with-uMatrix.md)
+- [Public Invidious Instances](./instances.md)
+- [Applications](./applications.md.md)
+- [Always proxy videos through server](./proxy-videos.md.md)
+- [Preferences](./preferences.md)
+- [Geoblocking, available quality and DASH](./geoblocking.md)
+- [Using search filters](./search-filters.md)
+- [List of URL parameters](./url-parameters.md)
+- [How to deal with uMatrix](./umatrix.md)
 
 ## For Administrators
 
-- [Installation](./Installation.md)
-- [Configuration](./Configuration.md)
-- [Apache2 Virtual Host with Reverse Proxy](./Apache2-Reverse-Proxy.md)
-- [Nginx Reverse Proxy Configuration](./NGINX-Reverse-Proxy.md)
-- [Database Information and Maintenance](./Database-Information-and-Maintenance.md)
-- [Issues with CAPTCHA](./Issues-with-CAPTCHA-on-Debian-and-Ubuntu.md)
-- [How to setup Anti-Captcha](./How-to-setup-Anti-Captcha.md)
+- [Installation](./installation.md)
+- [Configuration](./configuration.md)
+- [Apache2 Virtual Host with Reverse Proxy](./apache2.md)
+- [Nginx Reverse Proxy Configuration](./nginx.md)
+- [Database Information and Maintenance](./db-maintenance.md)
+- [Issues with CAPTCHA](./captcha-bug.md)
+- [How to setup Anti-Captcha](./anti-captcha.md)
 
 ## For Developers
 
-- [API](./API.md)
-- [Authenticated Endpoints](./Authenticated-Endpoints.md)
+- [API](./api.md)
+- [Authenticated Endpoints](./authenticated-endpoints.md)

docs/installation.md

@@ -200,7 +200,7 @@ shards update && shards install && crystal build src/invidious.cr --release
 
 ## Post-install configuration:
 
-Detailed configuration available in the [configuration guide](./Configuration.md).
+Detailed configuration available in the [configuration guide](./configuration.md).
 
 Because of various issues Invidious **must** be restarted often, at least once a day, ideally every hour.