add overview and creation of spaces

content/spaces/_index.en.md

content/spaces/_index.md

content/spaces/create/_index.en.md

content/spaces/create/_index.md

static/images/40_Space_Creation_10_de.png

static/images/40_Space_Creation_11_de.png

static/images/40_Space_Creation_12_de.png

static/images/40_Space_Creation_13_de.png

static/images/40_Space_Creation_14_de.png

static/images/40_Space_Creation_15_de.png

static/images/40_Space_Creation_1_de.png

static/images/40_Space_Creation_2_de.png

static/images/40_Space_Creation_3_de.png

static/images/40_Space_Creation_4_de.png

static/images/40_Space_Creation_5_de.png

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static/images/40_Space_Creation_7_de.png

static/images/40_Space_Creation_8_de.png

static/images/40_Space_Creation_9_de.png

static/images/40_Space_Overview_1_de.png