docs: Add description and fix title

docs/_index.md

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 +++
 title = 'kci-dev'
 date = 2024-01-14T07:07:07+01:00
+description = 'Tool for interact programmatically with KernelCI instances.'
 +++
 
-# kci-dev
-
 kci-dev is a cmdline tool for interact with a enabled KernelCI server
 Purpose of this tool to provide a easy way to use features of KernelCI Pipeline instance.
 

docs/checkout.md

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 +++
 title = 'checkout'
 date = 2024-01-14T07:07:07+01:00
+description = 'This command allow to test arbitary commit on the KernelCI Pipeline instance.'
 +++
 
-## checkout
-
 This command allow to test arbitary commit on the KernelCI Pipeline instance. This might be useful in several cases:
 - You want to test a specific commit, if it fails or pass test, or introduce any other degradation comparing to the current, or another commit.
 - You want to create snapshot of the test results on specific tags (releases, etc).

docs/results.md

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 +++
 title = 'results'
 date = 2024-01-14T07:07:07+01:00
+description = 'Command for show test results.'
 +++
 
-### results
-
 This command will show the test result by node id.
 
 Example:

docs/testretry.md

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 title = 'testretry'
 date = 2024-01-14T07:07:07+01:00
+description = 'Command for retry failed tests.'
 +++
 
-### testretry
-
 This command will retry the failed tests. In some cases tests may fail due to network issues, hardware problems,
 nature of test (flaky), etc. This command will retry the failed tests, and create additional test jobs for the failed tests.
 After observing the results, you can decide if test results were reliable, not, or maybe even test need improvement.