F module doc

A few changes to the documentation for creating new webui modules.

mentioned in issue #236 (closed)

@timm The section Update xml seems to be outdated as well.

Shouldn't we replace it with information about the default build properties file?

added 83 commits

• 1d52a41d...d32693c5 - 81 commits from branch dev
• 95a49094 - Merge branch 'dev' of gitlab.com:caosdb/caosdb-webui into dev
• f53a73e2 - Merge branch 'dev' into f-module-doc

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added 473 commits

• f53a73e2...96804a8b - 472 commits from branch dev
• 48ffec59 - Merge branch 'dev' into 'f-module-doc'

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@timm This MR is really old, and actually it's only a small extension of the docs. Can you have a look at it?

resolved all threads

added 102 commits

• 48ffec59...211cd369 - 101 commits from branch dev
• 03b4caeb - Merge branch 'dev' into f-module-doc

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mentioned in commit 6e4802f4

merged