Make text more concise / shorten

[sypets]

Some of the text can be shortened to about half of the length without loosing much of the information.

While we do think having a few introductory sentences is good and this text does a good job of taking the user by the hand and leading him through the material, a few suggestions:

• remove historical references to TYPO3 4, pibase programming, flow, history of Neos etc. that are no longer of much value today. The reader wants to learn extension development.
• remove redundancies: Some pages contain redundancies where one thing is mentioned several times in different words. Make text as short as possible without loosing information or writing style (friendly!)

[linawolf]

We are at it ;)