Misc: rust, shortcuts, show indent, org-mode to HTML improvement

Keybindings:

- Rust F5 - show run targets
- Rust Shift-F5 - run last target
- Normal: Space-o - open current file in chromium
- Visual: Space-f - LSP format current region

Configuration:

- org-mode: use pandoc to generate a standalone HTML, support plantuml
  blocks
- no winbar for neo tree
- disabled treesitter asciidoc, seems to be broken
- splash screen: added browse, reordered entries

Plugins:

- use indent-blankline to visualize indents

lua/keybindings.lua

@@ -23,6 +23,9 @@ vim.keymap.set('n', '<leader>T', ":Neotree reveal<CR>", { desc = "File Manager"
 -- calendar
 vim.keymap.set('n', '<leader>c', ":Calendar -split=horizontal -position=below -height=12<CR>", { desc = "Show calendar" })
 
+-- Open current file in browser (chromium)
+vim.keymap.set('n', '<space>o', ":silent !chromium '%'<cr>", { desc = "Open in browser" })
+
 --
 -- configure workspaces
 -- also add a custom picker to fzf