Docs/minor fixes

[thorinaboenke]

• Fixed typos, grammar and copy-paste mistakes across the docs
• Replaced all -- pseudo-dashes in the docs
• Enabled navigation.footer and removed the "Go back Index" links
• Removed the orphaned docs/examples/others/basic_usage.py
• Installation: added requirements and git clone
• Basic knowledge: fixed the logging example and the parsed-log table, added the EventID concept
• Quickstart: fixed paths, added "Before you start", output files are overwritten instead of appended
• Tutorial: own data files in docs/examples/data/, path note simplified, stale claims corrected
• Schemas: corrected field types, documented raised exceptions, renamed "Tutorial" to "Examples"
• Parsers: documented what run() fills in, the parse() input and the parse() return values
• Detectors: fixed the API snippet and config example, documented named EventIDs and the auto_config default
• Alert aggregation: fixed class names and the API, documented the window behavior and run()
• Federation: fixed the Bigram Frequency claim, the example typos and the "Stack later" heading
• Contribution and development guides: fixed headings, the git checkout command and the doc-test command
• Corrected the Value Range, Combo, JSON and LogBatcher page descriptions
• Code: exported IncorrectSchema and NotSupportedSchema from detectmatelibrary.schemas, and fixed the return annotations

(feedback on bigger structural issues will follow separately)

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[viktorbeck98]

A nice improvement of the documentation!