docs(fix): rename doc to docs (#951)

* - renamed doc folder to docs
- updated links between documentation files
- updated "Get Started" section in CONTRIBUTING file

* docs: fix typos

* docs: remove empty lines

Signed-off-by: Thorben Hartmann <[email protected]>

* docs: remove empty lines and premature sentence wrapping

Signed-off-by: Thorben Hartmann <[email protected]>

* docs: removing new line and sentence wrapping

Signed-off-by: Thorben Hartmann <[email protected]>

* docs: remove new lines and sentence wrapping

Signed-off-by: Thorben Hartmann <[email protected]>

* docs: remove new lines

Signed-off-by: Thorben Hartmann <[email protected]>

* docs: remove new lines

Signed-off-by: Thorben Hartmann <[email protected]>

* docs: remove new lines

Signed-off-by: Thorben Hartmann <[email protected]>

* docs: remove new lines

Signed-off-by: Thorben Hartmann <[email protected]>

* docs: remove empty lines

Signed-off-by: Thorben Hartmann <[email protected]>

* docs: remove empty lines

Signed-off-by: Thorben Hartmann <[email protected]>

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Signed-off-by: Thorben Hartmann <[email protected]>