feat(nvim): Markdown handling improvements

- marksman: Trimmed config file: removed comments, remove default
  settings
- fix: ftplugin for codelens: provide current buffer
- new: Add obsidian.nvim plugin to replace markdown-oxide lsp

common/.config/marksman/config.toml

@@ -1,36 +1,15 @@
 [core]
 
 markdown.file_extensions = ["md", "markdown"]
-# Configures text sync protocol between the editor (LSP client)
-# and Marksman (LSP server).
-# Can be either 'full' or `incremental`:
-# * full: the whole copy of a document is sent by the editor
-#   on every update,
-# * incremental: only the changed parts are sent by
-#   the editor. This will result in less trafic between
-#   the editor and Marksman, but the overall performance
-#   impact is marginal.
-# Defaults to `full` because the editors have bugs in incremental
-# sync which result in slightly correpted state and are really hard
-# to diagnose.
-text_sync = "incremental"
-# Use incremental resolution of project-wide references.
-# This is much more efficient but is currently experimental
-incremental_references = true
-# For debugging only! Enables extra validation checks around
-# incremental state updates. SIGNIFICANTLY IMPACTS PERFORMANCE
+text_sync = "full"
+title_from_heading = true
+incremental_references = false
 paranoid = false
 
 [code_action]
-# Enable/disable "Table of Contents" code action
 toc.enable = true
-
-# Enable/disable "Create missing linked file" code action
 create_missing_file.enable = false
 
 [completion]
-# The style of wiki links completion.
-# Other values include:
-# * "file-stem" to complete using file name without an extension,
-# * "file-path-stem" same as above but using file path.
-wiki.style = "title-slug"
+candidates = 50
+wiki.style = "file-path-stem"