Massive theme overhaul (#62)

* progress on overhaul

* finish scrutinization of languages existing in old colors file

* remove markdown code block highlight due to broken upstream syntax

* add user config globals

* update issue and pull request templates

* small fixes

* fix "illegal value" error when using overrides

* actually fix the attribute filter this time

* add git commit diff colors. closes #46

* remove unnecessary duplicate

* set SignColumn explicitly

* Add a helpfile (#64)

* Ignore the tags file generated by :helptags

* Write the help file

.github/issue_template.md

@@ -1 +1,45 @@
-> If you're reporting an UI issue, make sure you take a screenshot that shows the actual bug.
+<!--
+Thanks for your interest in reporting an issue.
+
+Before submitting, please refer to the following common issues and solutions:
+
+Running vim in a terminal?
+- Try adding `set termguicolors` to your vimrc.
+
+Running vim with tmux?
+- Be sure you have terminal-overrides to enable truecolor (if supported in your term)
+- Be sure your `default-terminal` is set to, ideally, `tmux-256color`. If your OS doesn't
+  have `tmux-256color` terminfo files, google them and add them using `tic`
+
+Having issues with font styles (italic, bold, underline)?
+- Be sure your terminal supports these styles.
+- If running tmux, see tmux section.
+- If all else fails, disable the style by setting `let g:dracula_<style-name> = 0`
+  in your vimrc, where `<style-name>` is one of (`italic`, `bold`, `underline`, `undercurl`, `inverse`)
+
+If the above did not resolve your issue, please complete all fields of the form below.
+-->
+
+### What happened
+
+### What I expected to happen
+
+### Screenshot
+
+### Machine Info
+<!--
+if on a *nix system, please provide the output of `uname -a` for OS field
+-->
+- **Vim type (`vim`/`gvim`/`neovim`)**:
+- **Vim version**:
+- **OS**:
+- **Terminal/Terminal Emulator/VTE**:
+- **`TERM` environment variable**:
+
+### Additional Info
+<!--
+If using Tmux, please provide the output of `tmux info`
+
+If having issues with text rendering, please provide the output of `infocmp`
+-->
+

.github/pull_request_template.md

@@ -1 +1,5 @@
-> If you're fixing a UI issue, make sure you take two screenshots. One that shows the actual bug and another that shows how you fixed it.
+<!--
+If you're fixing a UI issue, make sure you take two screenshots.
+One that shows the actual bug and another that shows how you fixed it.
+-->
+

.gitignore

@@ -0,0 +1 @@
+doc/tags