update init.lua to support java lsp

[advpetc]

Summary

• Add abbreviated path display in Telescope (shows first letter of parent directories for cleaner UI)
• Add vim-fugitive for git operations (:Git, :Git diff, :Git blame, etc.)
• Remove gitsigns plugin (prefer fugitive for git workflow)
• Add Java IDE setup documentation

Test plan

• Open Neovim and run :Telescope live_grep - paths should show abbreviated (e.g., t/t/s/m/j/TscpFile.java)
• Run :Git status to verify vim-fugitive works
• Verify gitsigns is removed with :Lazy