chore: add GitHub issue templates and funding config

.github/FUNDING.yml

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+github: swaits

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug in tiny-packupdate.nvim
+title: ""
+labels: bug
+assignees: ""
+---
+
+**Neovim version** (`nvim --version`):
+
+**tiny-packupdate.nvim version/commit**:
+
+**Setup**:
+
+```lua
+require("tiny-packupdate").setup({
+  -- your config here
+})
+```
+
+**Describe the bug**:
+
+**Steps to reproduce**:
+
+1.
+2.
+3.
+
+**Expected behavior**:
+
+**Actual behavior**:
+
+**Screenshots** (if applicable):

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for tiny-packupdate.nvim
+title: ""
+labels: enhancement
+assignees: ""
+---
+
+**Is your feature request related to a problem?**
+
+**Describe the solution you'd like**:
+
+**Describe alternatives you've considered**:
+
+**Additional context**: