Update READMEs and delete deprecated docs

[adeatcu-ionos]

Solves https://github.com/ionos-cloud/sdk-nodejs/issues/5 by fixing the example from the README.md.

This also represents a follow up for this discussion.

In this PR, the READMEs are updated accordingly and the deprecated documentation is deleted.

[DanielRuf]

Hi, there is also one more at https://github.com/ionos-cloud/sdk-nodejs/tree/master/docs#usage

[DanielRuf]

Besides that, there is a very old DOCS.md file at https://github.com/ionos-cloud/sdk-nodejs/blob/master/DOCS.md which contains more suche cases.

Not sure if this file is still used or obsolete like the old lowercase files (see https://github.com/ionos-cloud/sdk-nodejs/issues/5#issuecomment-1259487707).

[adeatcu-ionos]

@DanielRuf

Hi, there is also one more at https://github.com/ionos-cloud/sdk-nodejs/tree/master/docs#usage

Hi, I fixed this typo in this commit.

Besides that, there is a very old DOCS.md file at https://github.com/ionos-cloud/sdk-nodejs/blob/master/DOCS.md which contains more suche cases.

I discussed with the team and we decided to delete those files. I deleted them in this commit.

[sonarcloud[bot]]

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[adeatcu-ionos]

@mimihalescu please review again because I added another example in the READMEs as a follow up to this comment, thank you!

[DanielRuf]

Perfect, thank you very much =)