update docs for installing-from-gui section

[qlrd]

Description

This PR just update the "Installing from GUI" section:

• Split text in to many sections
• update to newest installer release (v0.0.2-alpha)

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.21%. Comparing base (1b03495) to head (569bd12).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #450   +/-   ##
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  Coverage    94.21%   94.21%           
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  Files           59       59           
  Lines         7259     7259           
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  Hits          6839     6839           
  Misses         420      420           

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[odudex]

Exemplary documentation! There are minor issues. 2 broken links, listed in mkdocs debug INFO (one left by me!)
On /snippets/verify-the-signature-trust-tip.en.txt should #verify-its-authenticity become #verify-the-authenticity?
Could you please fix mine to?
On /getting-started/usage/navigating-the-main-menu.en.md . [More about wallet attributes](./loading-a-mnemonic.md/#attributes) becomes [More about wallet attributes](./loading-a-mnemonic.md/#confirm-wallet-attributes)

[qlrd]

On /snippets/verify-the-signature-trust-tip.en.txt should #verify-its-authenticity become #verify-the-authenticity? Could you please fix mine to? On /getting-started/usage/navigating-the-main-menu.en.md . [More about wallet attributes](./loading-a-mnemonic.md/#attributes) becomes [More about wallet attributes](./loading-a-mnemonic.md/#confirm-wallet-attributes)

Fixed both (i think)

[odudex]

Thank you!