chore(docs): Fix invalid links

Closes #1020

Author: kristijanhusak

README.org

@@ -198,5 +198,5 @@ issue.
 
 - [[https://github.com/dhruvasagar][@dhruvasagar]] and his [[https://github.com/dhruvasagar/vim-dotoo][vim-dotoo]] plugin
   that got me started using orgmode. Without him this plugin would not happen.
-- [[https://github.com/milisims][@milisims]] for writing a treesitter parser for org
+- [[https://github.com/emiasims][@emiasims]] for writing a treesitter parser for org
 - [[https://github.com/jceb/vim-orgmode][vim-orgmode]] for some parts of the code (mostly syntax)

docs/contributing.org

@@ -98,7 +98,7 @@ can be installed, and exit with a success message.
 :PROPERTIES:
 :CUSTOM_ID: parser
 :END:
-Parsing is done via builtin treesitter parser and the [[https://github.com/milisims/tree-sitter-org][tree-sitter-org]] grammar.
+Parsing is done via builtin treesitter parser and the [[https://github.com/nvim-orgmode/tree-sitter-org][tree-sitter-org]] grammar.
 
 **** Commits
 :PROPERTIES:

store.md

@@ -214,7 +214,7 @@ issue.
 - [@dhruvasagar](https://github.com/dhruvasagar) and his
   [vim-dotoo](https://github.com/dhruvasagar/vim-dotoo) plugin that got
   me started using orgmode. Without him this plugin would not happen.
-- [@milisims](https://github.com/milisims) for writing a treesitter
+- [@emiasims](https://github.com/emiasims) for writing a treesitter
   parser for org
 - [vim-orgmode](https://github.com/jceb/vim-orgmode) for some parts of
   the code (mostly syntax)