Feature/one liner install and landing page

[shodiBoy1]

This PR fixes #1797

Implemented changes:

• Fixed detect_os() in install.sh to handle Windows Git Bash by adding MINGW*|MSYS*|CYGWIN* pattern detection

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Checklist for this PR

• 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

[coveralls]

Pull Request Test Coverage Report for Build 23963344635

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.009%) to 70.634%

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Files with Coverage Reduction	New Missed Lines	%
com/devonfw/tools/ide/tool/ide/IdeToolCommandlet.java	1	78.33%

Totals
Change from base Build 23912440091:	-0.009%
Covered Lines:	10885
Relevant Lines:	14791

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💛 - Coveralls