#1763: Add documentation for downloading SNAPSHOT releases manually

[areinicke]

This PR fixes #1763

Implemented changes:

• Added documentation on how to download SNAPSHOT releases for IDEasy manually, including for other platforms

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Checklist for this PR

Make sure everything is checked before merging this PR. For further info please also see
our DoD.

• When running mvn clean test locally all tests pass and build is successful
• PR title is of the form #«issue-id»: «brief summary» (e.g. #921: fixed setup.bat). If no issue ID exists, title only.
• PR top-level comment summarizes what has been done and contains link to addressed issue(s)
• PR and issue(s) have suitable labels
• Issue is set to In Progress and assigned to you or there is no issue (might happen for very small PRs)
• You followed all coding conventions
• You have added the issue implemented by your PR in CHANGELOG.adoc unless issue is labeled
  with internal

[areinicke]

I don't think a CHANGELOG entry is necessary for this, is it?

[coveralls]

Coverage Report for CI Build 25655509261

Coverage decreased (-0.004%) to 70.665%

Details

• Coverage decreased (-0.004%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 1 coverage regression across 1 file.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

1 previously-covered line in 1 file lost coverage.

File	Lines Losing Coverage	Coverage
com/devonfw/tools/ide/version/VersionSegment.java	1	88.71%

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Coverage Stats

Relevant Lines:	15412
Covered Lines:	11351
Line Coverage:	73.65%
Relevant Branches:	6882
Covered Branches:	4403
Branch Coverage:	63.98%
Branches in Coverage %:	Yes
Coverage Strength:	3.11 hits per line

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💛 - Coveralls