Update neovim setup

Switch from pyright to python-lsp-server

templates/nvim/lua/options.lua.j2

@@ -1,58 +1,62 @@
 -- {{ ansible_managed }} {{ ansible_date_time.time }} {{ ansible_date_time.date }}
 
---fix different locale settings when ssh'ing
+-- fix different locale settings when ssh'ing
 vim.o.encoding = 'utf-8'
 
 vim.o.syntax = 'on'
 
---display all matching files when we tab complete
+-- display all matching files when we tab complete
 vim.o.wildmenu	 = true
 
---replace vertical split pipe character with space
+-- replace vertical split pipe character with space
 vim.o.fillchars = 'vert:|,fold: '
 
---Having longer updatetime (default is 4000 ms = 4 s) leads to noticeable
---delays and poor user experience.
+-- Having longer updatetime (default is 4000 ms = 4 s) leads to noticeable
+-- delays and poor user experience.
 vim.o.updatetime = 300
 
 vim.o.splitright = true
 vim.o.splitbelow = true
 
---switch buffers without writing to file
-vim.o.hidden = true  
+-- switch buffers without writing to file
+vim.o.hidden = true
 
---fold indents
-vim.o.foldmethod = 'indent'
+-- folding
+vim.o.foldmethod = 'expr'
+vim.o.foldexpr = 'nvim_treesitter#foldexpr()'
 
---don't open folds when jumping over one with (, {, [[ or [{
+-- don't open folds when jumping over one with (, {, [[ or [{
 vim.opt.foldopen = vim.opt.foldopen - { 'block' }
 
---search down into subfolders
---provides tab-completion for all file-related tasks
+-- search down into subfolders
+-- provides tab-completion for all file-related tasks
 vim.opt.path = vim.opt.path + { '**' }
 
---line numbers
+-- line numbers
 vim.o.number = true
 
---higlhight search
+-- higlhight search
 vim.o.hls = true
 
---search as characters are entered
+-- search as characters are entered
 vim.o.incsearch = true
 
---line for linewrapping
+-- line for linewrapping
 vim.o.colorcolumn = '80'
 
---wrap text instead of being on one line
+-- wrap text instead of being on one line
 vim.o.lbr = true
 
---default Colors for CursorLine
+-- default Colors for CursorLine
 vim.o.cursorline = true
 
 -- theme related
 vim.o.termguicolors = true
 vim.o.background = 'light'
 
---enable statusbar
+-- enable statusbar
 vim.o.laststatus = 2
 vim.o.statusline = ' %F %m%r%w %= %{hostname()}   %{strlen(&ft)?&ft:"none"} %{(&bomb?",BOM":"")} %{&ff}  %l/%L  %c %P'
+
+-- python interpreter
+vim.g.python3_host_prog = './env/bin/python'