replace d2lang support with markdown and mermaid stuff, remove perl

Dockerfile

@@ -25,8 +25,6 @@ ENV PYTHON_DEVEL_PKGS="\
     python3\
     conda"
 
-ENV PERL_DEVEL_PKGS="perl-App-cpanminus"
-
 ENV MASON_PKGS=" \
     bash-language-server \
     css-lsp \
@@ -39,7 +37,6 @@ ENV MASON_PKGS=" \
     lemminx \
     lua-language-server \
     marksman \
-    perlnavigator \
     phpcs \
     phpstan \
     pyright \
@@ -56,11 +53,9 @@ ENV PIP_PKGS="pynvim ansible ansible-lint"
 COPY . /root/.config/nvim
 # install system dependencies
 RUN dnf install -y \
-    ${GENERAL_PKGS} ${NEOVIM_PKGS} ${PYTHON_DEVEL_PKGS} ${PERL_DEVEL_PKGS} \
+    ${GENERAL_PKGS} ${NEOVIM_PKGS} ${PYTHON_DEVEL_PKGS} \
     && dnf clean all && \
-    cpanm PLS && \
-    pip install ${PIP_PKGS} && \
-    curl -fsSL https://d2lang.com/install.sh | sh -s --
+    pip install ${PIP_PKGS}
 
 RUN rm /root/.config/nvim/lazy-lock.json || true
 # install lsp and linters using mason

README.md

@@ -161,6 +161,24 @@ This container will not be removed on exit, you can reenter later with:
 podman start -ai {project/container name}
 ```
 
+## Additional packages to install as needed
+
+### Perl lang
+
+For Perl language support run this command to install required packages for
+lsp server:
+
+```bash
+dnf install -y perl-App-cpanminus;
+cpanm PLS;
+```
+
+And then in neovim:
+
+```bash
+:MasonInstall perlnavigator
+```
+
 ## Inside vim
 
 ```vim
@@ -240,6 +258,14 @@ All that is saved in image, so that is why image is so heavy.
 |Ctrl+v |	Open selection as a vsplit|
 |Ctrl+t |	Open selection in new tab |
 
+#### Markdown Preview
+
+Mardkown Preview plugin commands:
+
+```bash
+:MarkdownPreview*
+```
+
 #### Git stuff
 
 |keys|action|

lua/general.lua

@@ -12,6 +12,12 @@ local function map(mode, lhs, rhs, opts)
     vim.api.nvim_set_keymap(mode, lhs, rhs, options)
 end
 
+--mardown preview settings
+vim.cmd [[
+    let g:mkdp_echo_preview_url = 1
+]]
+
+
 ----------------------
 -- general setup start
 ----------------------

lua/lazy-load.lua

@@ -1,5 +1,9 @@
 require("lazy").setup({
-        { 'terrastruct/d2-vim' },
+        {
+            'iamcco/markdown-preview.nvim',
+            build = function() vim.fn["mkdp#util#install"]() end
+        },
+        { 'mracos/mermaid.vim' },
         -- Nvim-tree stuff
         { 'nvim-tree/nvim-web-devicons' }, -- optional, for file icons
         {