Remove nvim generated/downloaded files from tracking

Stop tracking auto-generated directories and caches:
- config/nvim/lazy/ (downloaded plugins)
- config/nvim/mason/ (language servers/tools)
- config/nvim/dirsession/ (session-specific data)
- config/nvim/session/ (session files)

These are now properly ignored in .gitignore.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

config/nvim/dirsession/_Users_michi.json

@@ -1 +0,0 @@
-{"global":{"width":180,"height":58,"options":{"cmdheight":0},"cwd":"/Users/michi"},"tab_scoped":false,"astrocore":{"bufnrs":{"/Users/michi/.ssh/config":1},"current_buf":1,"tabs":[[1]]},"tabs":[{"wins":["leaf",{"width":180,"height":56,"bufname":"/Users/michi/.ssh/config","options":{"winfixheight":false,"diff":false,"scrollbind":false,"previewwindow":false,"winfixwidth":false},"current":true,"cursor":[58,5]}],"options":{"cmdheight":0}}],"buffers":[{"name":"/Users/michi/.ssh/config","loaded":true,"last_pos":[58,4],"options":{"modifiable":true,"buflisted":true,"bufhidden":"","binary":false,"readonly":false,"filetype":"sshconfig"}}],"quickfix":[]}

config/nvim/dirsession/_Users_michi_Documents_workspace_private_Typst_anschreiben_michi.json

@@ -1 +0,0 @@
-{"tab_scoped":false,"quickfix":[],"tabs":[{"options":{"cmdheight":0},"wins":["leaf",{"height":56,"options":{"previewwindow":false,"winfixheight":false,"winfixwidth":false,"scrollbind":false,"diff":false},"bufname":"\/Users\/michi\/Documents\/workspace_private\/Typst_anschreiben_michi\/Anschreiben_Michi.typ","cursor":[33,10],"current":true,"width":180}]}],"global":{"height":58,"cwd":"\/Users\/michi\/Documents\/workspace_private\/Typst_anschreiben_michi","options":{"cmdheight":0},"width":180},"astrocore":{"current_buf":1,"bufnrs":{"\/Users\/michi\/Documents\/workspace_private\/Typst_anschreiben_michi\/Anschreiben_Michi.typ":1},"tabs":[[1]]},"buffers":[{"name":"\/Users\/michi\/Documents\/workspace_private\/Typst_anschreiben_michi\/Anschreiben_Michi.typ","last_pos":[55,11],"options":{"buflisted":true,"binary":false,"readonly":false,"bufhidden":"","modifiable":true,"filetype":"typst"},"loaded":true}]}

config/nvim/dirsession/_Users_michi_dotfiles.json

@@ -1 +0,0 @@
-{"tabs":[{"options":{"cmdheight":0},"wins":["leaf",{"current":true,"cursor":[5,11],"bufname":"\/Users\/michi\/dotfiles\/.gitignore","width":180,"options":{"winfixwidth":false,"winfixheight":false,"diff":false,"previewwindow":false,"scrollbind":false},"height":56}]}],"quickfix":[],"global":{"options":{"cmdheight":0},"height":58,"width":180,"cwd":"\/Users\/michi\/dotfiles"},"tab_scoped":false,"astrocore":{"bufnrs":{"\/Users\/michi\/dotfiles\/.gitignore":1},"tabs":[[1]],"current_buf":1},"buffers":[{"options":{"buflisted":true,"modifiable":true,"bufhidden":"","binary":false,"readonly":false,"filetype":"gitignore"},"last_pos":[6,15],"name":"\/Users\/michi\/dotfiles\/.gitignore","loaded":true}]}

config/nvim/dirsession/_Users_michi_dotfiles_config_fish.json

@@ -1 +0,0 @@
-{"tabs":[{"options":{"cmdheight":0},"wins":["leaf",{"cursor":[48,7],"height":27,"options":{"winfixheight":false,"diff":false,"previewwindow":false,"scrollbind":false,"winfixwidth":false},"current":true,"width":180,"bufname":"\/Users\/michi\/dotfiles\/config\/fish\/config.fish"}]}],"tab_scoped":false,"quickfix":[],"buffers":[{"name":"\/Users\/michi\/dotfiles\/config\/fish\/config.fish","options":{"modifiable":true,"binary":false,"buflisted":true,"bufhidden":"","filetype":"fish","readonly":false},"loaded":true,"last_pos":[44,1]}],"astrocore":{"tabs":[[1]],"current_buf":1,"bufnrs":{"\/Users\/michi\/dotfiles\/config\/fish\/config.fish":1}},"global":{"options":{"cmdheight":0},"cwd":"\/Users\/michi\/dotfiles\/config\/fish","width":180,"height":29}}

config/nvim/mason/registries/github/mason-org/mason-registry/info.json

@@ -1 +0,0 @@
-{"download_timestamp":1744870127,"checksums":{"registry.json":"d2a55f609b635196e0ef489745796d66dcf2e32c8cd986555c45c7177b94a306","registry.json.zip":"5d460649298f575b61d6148ea771cc198d11eb8f8dc9fd361d73e62f101ae6ac"},"version":"2025-04-17-pumped-fog"}

config/nvim/session/Last Session.json

@@ -1 +0,0 @@
-{"buffers":[{"name":"/Users/michi/Downloads/cortex_install.md","options":{"readonly":false,"buflisted":true,"bufhidden":"","binary":false,"modifiable":true,"filetype":"markdown"},"last_pos":[1,0],"loaded":true}],"quickfix":[],"global":{"width":156,"height":51,"options":{"cmdheight":0},"cwd":"/"},"tab_scoped":false,"astrocore":{"bufnrs":{"/Users/michi/Downloads/cortex_install.md":2},"current_buf":2,"tabs":[[2]]},"tabs":[{"wins":["leaf",{"cursor":[13,1],"bufname":"/Users/michi/Downloads/cortex_install.md","current":true,"height":49,"options":{"scrollbind":false,"diff":false,"winfixheight":false,"winfixwidth":false,"previewwindow":false},"width":156}],"options":{"cmdheight":0}}]}