Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: "\U0001F41E Bug"
+assignees: ''
+
+---
+
+Describe your problem here. Provide pictures and files if necessary.
+
+---
+
+* Your font version: (Release or git, version)
+* Your font variant:
+* Your operating system (name and version):
+* Your application using Iosevka: 
+
+If you have problem when building Iosevka, please provide these information:
+
+* Your Node.js version:
+* Your _otfcc_ version:
+* Your `params/parameters.toml`, paste if modified:
+  ```
+  paste here
+  ```
+* Your `build-plans.toml`, paste if modified:
+  ```
+  paste here
+  ```
+* Your `private-build-plans.toml`, if present:
+  ```
+  paste here
+  ```
+* The detailed error log:
+  ```
+  paste here
+  ```

.github/ISSUE_TEMPLATE/character-request.md

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+---
+name: Character Request
+about: Request Iosevka to support a character
+title: ''
+labels: "\U0001F170️ Character Request"
+assignees: ''
+
+---
+
+- The requested character is...
+  - [ ] Latin
+  - [ ] Cyrillic
+  - [ ] Greek
+  - [ ] Punctuation
+  - [ ] Symbol
+- [ ] Some other monospace/programming fonts supported this character. Provide images below.
+
+------
+
+*Please provide justification here.*

.github/ISSUE_TEMPLATE/character-variant-request.md

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+---
+name: Character Variant Request
+about: Request a variant shape of an existing character
+title: ''
+labels: "\U0001F503 Variant Request"
+assignees: ''
+
+---
+
+- [ ] The requested variant shape does not go too far away from Iosevka's design.
+- [ ] The requested variant does not conflict with any characters in Unicode that Iosevka currently supports.
+- [ ] Some other monospace/programming fonts supported the requested variant. Provide images below.
+
+------
+
+*Please provide your your justification here.*

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.