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

after/ftplugin/rust.lua

@@ -6,5 +6,26 @@ vim.keymap.set(
   function()
     vim.cmd.RustLsp({ 'explainError', 'current' })
   end,
-  { silent = true, buffer = bufnr, desc = 'Rust: explain error at cursor' }
+  { silent = true, buffer = bufnr, desc = 'RustLSP: explain error at cursor' }
+)
+
+
+-- show run targets
+vim.keymap.set(
+  "n",
+  "<f5>",
+  function()
+    vim.cmd.RustLsp({ 'runnables' })
+  end,
+  { silent = true, buffer = bufnr, desc = 'RustLSP: show runnables' }
+)
+
+-- run last target
+vim.keymap.set(
+  "n",
+  "<S-f5>",
+  function()
+    vim.cmd.RustLsp({ 'runnables', bang = true })
+  end,
+  { silent = true, buffer = bufnr, desc = 'RustLSP: show runnables' }
 )