Add note to TLDR to remind users to configure PrivateBin, change links, add sql syntax highlighting

Installation.md

@@ -3,7 +3,8 @@
 **TL;DR:** Download the
 [latest release archive](https://github.com/PrivateBin/PrivateBin/releases/latest)
 and extract it in your web hosts folder were you want to install your PrivateBin
-instance.
+instance. Afterwards adjust the configuration. This is relevant for the security of
+your PrivateBin instance!
 
 ### Requirements
 
@@ -26,7 +27,7 @@ you set a time limit in seconds. Users may not post more often then this limit
 to your PrivateBin installation.
 
 More details can be found in the
-[configuration documentation](https://github.com/PrivateBin/PrivateBin/wiki/Configuration).
+[configuration documentation](../Configuration).
 
 ## Advanced installation
 
@@ -92,6 +93,7 @@ gain any experience running PrivateBin on other RDBMS, please let us know.
 
 For reference or if you want to create the table schema for yourself:
 
+```sql
 CREATE TABLE prefix_paste (
     dataid CHAR(16) NOT NULL,
     data BLOB,
@@ -121,3 +123,4 @@ For reference or if you want to create the table schema for yourself:
     id CHAR(16) NOT NULL, value TEXT, PRIMARY KEY (id)
 );
 INSERT INTO prefix_config VALUES('VERSION', '0.22');
+```